12581125656 has 64 divisors (see below), whose sum is σ = 34334496000. Its totient is φ = 3809980800.

The previous prime is 12581125619. The next prime is 12581125657. The reversal of 12581125656 is 65652118521.

It is a super-2 number, since 2×12581125656² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12581125657) 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 15 ways as a sum of consecutive naturals, for example, 413245 + ... + 442643.

It is an arithmetic number, because the mean of its divisors is an integer number (536476500).

Almost surely, 2^12581125656 is an apocalyptic number.

It is an amenable number.

12581125656 is an abundant number, since it is smaller than the sum of its proper divisors (21753370344).

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

12581125656 is a wasteful number, since it uses less digits than its factorization.

12581125656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31040 (or 31036 counting only the distinct ones).

The product of its digits is 144000, while the sum is 42.

The spelling of 12581125656 in words is "twelve billion, five hundred eighty-one million, one hundred twenty-five thousand, six hundred fifty-six".