256720399201 has 32 divisors (see below), whose sum is σ = 330276331008. Its totient is φ = 194359925760.

The previous prime is 256720399147. The next prime is 256720399217. The reversal of 256720399201 is 102993027652.

It is not a de Polignac number, because 256720399201 - 2³³ = 248130464609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256720399261) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 739810 + ... + 1029931.

It is an arithmetic number, because the mean of its divisors is an integer number (10321135344).

Almost surely, 2^256720399201 is an apocalyptic number.

It is an amenable number.

256720399201 is a deficient number, since it is larger than the sum of its proper divisors (73555931807).

256720399201 is a wasteful number, since it uses less digits than its factorization.

256720399201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1769841.

The product of its (nonzero) digits is 408240, while the sum is 46.

The spelling of 256720399201 in words is "two hundred fifty-six billion, seven hundred twenty million, three hundred ninety-nine thousand, two hundred one".