256516034420 has 12 divisors (see below), whose sum is σ = 538683672324. Its totient is φ = 102606413760.

The previous prime is 256516034419. The next prime is 256516034429. The reversal of 256516034420 is 24430615652.

It can be written as a sum of positive squares in 2 ways, for example, as 165898177636 + 90617856784 = 407306^2 + 301028^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256516034429) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6412900841 + ... + 6412900880.

It is an arithmetic number, because the mean of its divisors is an integer number (44890306027).

Almost surely, 2^256516034420 is an apocalyptic number.

256516034420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256516034420 is an abundant number, since it is smaller than the sum of its proper divisors (282167637904).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256516034420 is a wasteful number, since it uses less digits than its factorization.

256516034420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12825801730 (or 12825801728 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 38.

The spelling of 256516034420 in words is "two hundred fifty-six billion, five hundred sixteen million, thirty-four thousand, four hundred twenty".