12655856657 has 2 divisors, whose sum is σ = 12655856658. Its totient is φ = 12655856656.

The previous prime is 12655856639. The next prime is 12655856677. The reversal of 12655856657 is 75665855621.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12614883856 + 40972801 = 112316^2 + 6401^2 .

It is an emirp because it is prime and its reverse (75665855621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12655856657 - 2¹⁴ = 12655840273 is a prime.

It is not a weakly prime, because it can be changed into another prime (12655856617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6327928328 + 6327928329.

It is an arithmetic number, because the mean of its divisors is an integer number (6327928329).

Almost surely, 2^12655856657 is an apocalyptic number.

It is an amenable number.

12655856657 is a deficient number, since it is larger than the sum of its proper divisors (1).

12655856657 is an equidigital number, since it uses as much as digits as its factorization.

12655856657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120000, while the sum is 56.

The spelling of 12655856657 in words is "twelve billion, six hundred fifty-five million, eight hundred fifty-six thousand, six hundred fifty-seven".