12749392657 has 4 divisors (see below), whose sum is σ = 12958399156. Its totient is φ = 12540386160.

The previous prime is 12749392571. The next prime is 12749392693. The reversal of 12749392657 is 75629394721.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3317875201 + 9431517456 = 57601^2 + 97116^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12749392657 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12749392598 and 12749392607.

It is not an unprimeable number, because it can be changed into a prime (12749392057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104503158 + ... + 104503279.

It is an arithmetic number, because the mean of its divisors is an integer number (3239599789).

Almost surely, 2^12749392657 is an apocalyptic number.

It is an amenable number.

12749392657 is a deficient number, since it is larger than the sum of its proper divisors (209006499).

12749392657 is an equidigital number, since it uses as much as digits as its factorization.

12749392657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209006498.

The product of its digits is 5715360, while the sum is 55.

It can be divided in two parts, 1274 and 9392657, that added together give a cube (9393931 = 211³).

The spelling of 12749392657 in words is "twelve billion, seven hundred forty-nine million, three hundred ninety-two thousand, six hundred fifty-seven".