256168016931 has 8 divisors (see below), whose sum is σ = 341909118144. Its totient is φ = 170602796840.

The previous prime is 256168016921. The next prime is 256168016939. The reversal of 256168016931 is 139610861652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 256168016931 - 2¹³ = 256168008739 is a prime.

It is a super-2 number, since 2×256168016931² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (256168016939) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43966881 + ... + 43972706.

It is an arithmetic number, because the mean of its divisors is an integer number (42738639768).

Almost surely, 2^256168016931 is an apocalyptic number.

256168016931 is a deficient number, since it is larger than the sum of its proper divisors (85741101213).

256168016931 is an equidigital number, since it uses as much as digits as its factorization.

256168016931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87940561.

The product of its (nonzero) digits is 466560, while the sum is 48.

The spelling of 256168016931 in words is "two hundred fifty-six billion, one hundred sixty-eight million, sixteen thousand, nine hundred thirty-one".