12637506257 has 4 divisors (see below), whose sum is σ = 13380888996. Its totient is φ = 11894123520.

The previous prime is 12637506247. The next prime is 12637506263. The reversal of 12637506257 is 75260573621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75260573621 = 313 ⋅240449117.

It can be written as a sum of positive squares in 2 ways, for example, as 10322356801 + 2315149456 = 101599^2 + 48116^2 .

It is a cyclic number.

It is not a de Polignac number, because 12637506257 - 2⁴ = 12637506241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12637506247) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 371691344 + ... + 371691377.

It is an arithmetic number, because the mean of its divisors is an integer number (3345222249).

Almost surely, 2^12637506257 is an apocalyptic number.

12637506257 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

12637506257 is a deficient number, since it is larger than the sum of its proper divisors (743382739).

12637506257 is an equidigital number, since it uses as much as digits as its factorization.

12637506257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 743382738.

The product of its (nonzero) digits is 529200, while the sum is 44.

The spelling of 12637506257 in words is "twelve billion, six hundred thirty-seven million, five hundred six thousand, two hundred fifty-seven".