256501668 has 24 divisors (see below), whose sum is σ = 603076320. Its totient is φ = 84847360.

The previous prime is 256501667. The next prime is 256501697. The reversal of 256501668 is 866105652.

It is not an unprimeable number, because it can be changed into a prime (256501667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80013 + ... + 83156.

It is an arithmetic number, because the mean of its divisors is an integer number (25128180).

Almost surely, 2^256501668 is an apocalyptic number.

It is an amenable number.

256501668 is an abundant number, since it is smaller than the sum of its proper divisors (346574652).

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

256501668 is a wasteful number, since it uses less digits than its factorization.

256501668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163307 (or 163305 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 39.

The square root of 256501668 is about 16015.6694521334. The cubic root of 256501668 is about 635.3749148972.

The spelling of 256501668 in words is "two hundred fifty-six million, five hundred one thousand, six hundred sixty-eight".