122547416561 has 2 divisors, whose sum is σ = 122547416562. Its totient is φ = 122547416560.

The previous prime is 122547416549. The next prime is 122547416683. The reversal of 122547416561 is 165614745221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 98756205025 + 23791211536 = 314255^2 + 154244^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-122547416561 is a prime.

It is not a weakly prime, because it can be changed into another prime (122547416461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61273708280 + 61273708281.

It is an arithmetic number, because the mean of its divisors is an integer number (61273708281).

Almost surely, 2^122547416561 is an apocalyptic number.

It is an amenable number.

122547416561 is a deficient number, since it is larger than the sum of its proper divisors (1).

122547416561 is an equidigital number, since it uses as much as digits as its factorization.

122547416561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 403200, while the sum is 44.

The spelling of 122547416561 in words is "one hundred twenty-two billion, five hundred forty-seven million, four hundred sixteen thousand, five hundred sixty-one".