256854123831 has 16 divisors (see below), whose sum is σ = 350500296960. Its totient is φ = 167223463680.

The previous prime is 256854123821. The next prime is 256854123857. The reversal of 256854123831 is 138321458652.

It is not a de Polignac number, because 256854123831 - 2¹⁸ = 256853861687 is a prime.

It is a super-2 number, since 2×256854123831² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256854123821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 543175 + ... + 899303.

It is an arithmetic number, because the mean of its divisors is an integer number (21906268560).

Almost surely, 2^256854123831 is an apocalyptic number.

256854123831 is a deficient number, since it is larger than the sum of its proper divisors (93646173129).

256854123831 is a wasteful number, since it uses less digits than its factorization.

256854123831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361766.

The product of its digits is 1382400, while the sum is 48.

The spelling of 256854123831 in words is "two hundred fifty-six billion, eight hundred fifty-four million, one hundred twenty-three thousand, eight hundred thirty-one".