256025566 has 16 divisors (see below), whose sum is σ = 393987888. Its totient is φ = 124705600.

The previous prime is 256025557. The next prime is 256025597. The reversal of 256025566 is 665520652.

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, 65421 + ... + 69223.

It is an arithmetic number, because the mean of its divisors is an integer number (24624243).

Almost surely, 2^256025566 is an apocalyptic number.

256025566 is a deficient number, since it is larger than the sum of its proper divisors (137962322).

256025566 is a wasteful number, since it uses less digits than its factorization.

256025566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4667.

The product of its (nonzero) digits is 108000, while the sum is 37.

The square root of 256025566 is about 16000.7989175541. The cubic root of 256025566 is about 634.9815573208.

The spelling of 256025566 in words is "two hundred fifty-six million, twenty-five thousand, five hundred sixty-six".