256656022125 has 32 divisors (see below), whose sum is σ = 427458660096. Its totient is φ = 136760443200.

The previous prime is 256656022039. The next prime is 256656022141. The reversal of 256656022125 is 521220656652.

It is not a de Polignac number, because 256656022125 - 2¹² = 256656018029 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 112512 + ... + 725238.

It is an arithmetic number, because the mean of its divisors is an integer number (13358083128).

Almost surely, 2^256656022125 is an apocalyptic number.

256656022125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

256656022125 is a deficient number, since it is larger than the sum of its proper divisors (170802637971).

256656022125 is a wasteful number, since it uses less digits than its factorization.

256656022125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 613862 (or 613852 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 42.

Adding to 256656022125 its reverse (521220656652), we get a palindrome (777876678777).

The spelling of 256656022125 in words is "two hundred fifty-six billion, six hundred fifty-six million, twenty-two thousand, one hundred twenty-five".