256605706000 has 80 divisors (see below), whose sum is σ = 709111578240. Its totient is φ = 87979094400.

The previous prime is 256605705991. The next prime is 256605706013. The reversal of 256605706000 is 607506652.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9150490 + ... + 9178489.

It is an arithmetic number, because the mean of its divisors is an integer number (8863894728).

Almost surely, 2^256605706000 is an apocalyptic number.

256605706000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256605706000 is an abundant number, since it is smaller than the sum of its proper divisors (452505872240).

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

256605706000 is a wasteful number, since it uses less digits than its factorization.

256605706000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18329009 (or 18328993 counting only the distinct ones).

The product of its (nonzero) digits is 75600, while the sum is 37.

The spelling of 256605706000 in words is "two hundred fifty-six billion, six hundred five million, seven hundred six thousand".