12156272657 has 2 divisors, whose sum is σ = 12156272658. Its totient is φ = 12156272656.

The previous prime is 12156272591. The next prime is 12156272719. The reversal of 12156272657 is 75627265121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9402017296 + 2754255361 = 96964^2 + 52481^2 .

It is a cyclic number.

It is not a de Polignac number, because 12156272657 - 2¹⁶ = 12156207121 is a prime.

It is a super-2 number, since 2×12156272657² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12156272357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6078136328 + 6078136329.

It is an arithmetic number, because the mean of its divisors is an integer number (6078136329).

Almost surely, 2^12156272657 is an apocalyptic number.

It is an amenable number.

12156272657 is a deficient number, since it is larger than the sum of its proper divisors (1).

12156272657 is an equidigital number, since it uses as much as digits as its factorization.

12156272657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 352800, while the sum is 44.

The spelling of 12156272657 in words is "twelve billion, one hundred fifty-six million, two hundred seventy-two thousand, six hundred fifty-seven".