The ARN will give you the account ID that owns the SNS topic (if cross-account). For the future, you should put in place a tagging and/or naming standard to make it easy to determine the owner. Do some detective work: Look for where the SNS topic was created. Does it belong to a CloudFormation stack? That can give clues to ownership. Look at the Topic Policy for clues. You should have CloudTrail enabled. Find the consumer of the SNS topic: Search CloudTrail logs for the API events that created, modified, or read from the SNS topic. That can give you the IAM user. If you do not have CloudTrail enabled, enable it and check in a few hours/days.
Tagging: https://docs.aws.amazon.com/sns/latest/dg/sns-tags.html
CloudTrail: https://docs.aws.amazon.com/awscloudtrail/latest/userguide/cloudtrail-getting-started.html
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