256203431139 has 16 divisors (see below), whose sum is σ = 366653747232. Its totient is φ = 158552967168.

The previous prime is 256203431137. The next prime is 256203431167. The reversal of 256203431139 is 931134302652.

It is not a de Polignac number, because 256203431139 - 2¹ = 256203431137 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 256203431097 and 256203431106.

It is not an unprimeable number, because it can be changed into a prime (256203431131) 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, 34404474 + ... + 34411919.

It is an arithmetic number, because the mean of its divisors is an integer number (22915859202).

Almost surely, 2^256203431139 is an apocalyptic number.

256203431139 is a deficient number, since it is larger than the sum of its proper divisors (110450316093).

256203431139 is a wasteful number, since it uses less digits than its factorization.

256203431139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68816486.

The product of its (nonzero) digits is 116640, while the sum is 39.

The spelling of 256203431139 in words is "two hundred fifty-six billion, two hundred three million, four hundred thirty-one thousand, one hundred thirty-nine".