12657256120 has 32 divisors (see below), whose sum is σ = 28542294000. Its totient is φ = 5051619328.

The previous prime is 12657256081. The next prime is 12657256127. The reversal of 12657256120 is 2165275621.

It is a super-2 number, since 2×12657256120² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12657256120.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12657256127) 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 7 ways as a sum of consecutive naturals, for example, 334414 + ... + 370333.

Almost surely, 2^12657256120 is an apocalyptic number.

12657256120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12657256120 is an abundant number, since it is smaller than the sum of its proper divisors (15885037880).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12657256120 is a wasteful number, since it uses less digits than its factorization.

12657256120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 705207 (or 705203 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 37.

The spelling of 12657256120 in words is "twelve billion, six hundred fifty-seven million, two hundred fifty-six thousand, one hundred twenty".