256255802064 has 40 divisors (see below), whose sum is σ = 735549062720. Its totient is φ = 85418600544.

The previous prime is 256255802057. The next prime is 256255802083. The reversal of 256255802064 is 460208552652.

It is a happy number.

256255802064 is a `hidden beast` number, since 2 + 5 + 6 + 2 + 5 + 580 + 2 + 0 + 64 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 296591932 + ... + 296592795.

It is an arithmetic number, because the mean of its divisors is an integer number (18388726568).

Almost surely, 2^256255802064 is an apocalyptic number.

256255802064 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

256255802064 is an abundant number, since it is smaller than the sum of its proper divisors (479293260656).

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

256255802064 is a wasteful number, since it uses less digits than its factorization.

256255802064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 593184744 (or 593184732 counting only the distinct ones).

The product of its (nonzero) digits is 1152000, while the sum is 45.

The spelling of 256255802064 in words is "two hundred fifty-six billion, two hundred fifty-five million, eight hundred two thousand, sixty-four".