256400372722 has 32 divisors (see below), whose sum is σ = 441704188800. Its totient is φ = 110576233728.

The previous prime is 256400372717. The next prime is 256400372731. The reversal of 256400372722 is 227273004652.

It is a super-2 number, since 2×256400372722² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2025222 + ... + 2148097.

It is an arithmetic number, because the mean of its divisors is an integer number (13803255900).

Almost surely, 2^256400372722 is an apocalyptic number.

256400372722 is a deficient number, since it is larger than the sum of its proper divisors (185303816078).

256400372722 is a wasteful number, since it uses less digits than its factorization.

256400372722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4173490.

The product of its (nonzero) digits is 282240, while the sum is 40.

The spelling of 256400372722 in words is "two hundred fifty-six billion, four hundred million, three hundred seventy-two thousand, seven hundred twenty-two".