256557125 has 16 divisors (see below), whose sum is σ = 349292736. Its totient is φ = 186586000.

The previous prime is 256557109. The next prime is 256557139. The reversal of 256557125 is 521755652.

It is not a de Polignac number, because 256557125 - 2⁴ = 256557109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 91919 + ... + 94668.

It is an arithmetic number, because the mean of its divisors is an integer number (21830796).

Almost surely, 2^256557125 is an apocalyptic number.

256557125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

256557125 is a deficient number, since it is larger than the sum of its proper divisors (92735611).

256557125 is a wasteful number, since it uses less digits than its factorization.

256557125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186613 (or 186603 counting only the distinct ones).

The product of its digits is 105000, while the sum is 38.

The square root of 256557125 is about 16017.4006942450. The cubic root of 256557125 is about 635.4207020557.

The spelling of 256557125 in words is "two hundred fifty-six million, five hundred fifty-seven thousand, one hundred twenty-five".