12616981057537 has 2 divisors, whose sum is σ = 12616981057538. Its totient is φ = 12616981057536.

The previous prime is 12616981057511. The next prime is 12616981057589. The reversal of 12616981057537 is 73575018961621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12616981057521 + 16 = 3552039^2 + 4^2 .

It is a cyclic number.

It is not a de Polignac number, because 12616981057537 - 2⁷ = 12616981057409 is a prime.

It is a super-2 number, since 2×12616981057537² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12616981057937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6308490528768 + 6308490528769.

It is an arithmetic number, because the mean of its divisors is an integer number (6308490528769).

Almost surely, 2^{12616981057537} is an apocalyptic number.

It is an amenable number.

12616981057537 is a deficient number, since it is larger than the sum of its proper divisors (1).

12616981057537 is an equidigital number, since it uses as much as digits as its factorization.

12616981057537 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19051200, while the sum is 61.

The spelling of 12616981057537 in words is "twelve trillion, six hundred sixteen billion, nine hundred eighty-one million, fifty-seven thousand, five hundred thirty-seven".