256166655 has 16 divisors (see below), whose sum is σ = 410334720. Its totient is φ = 136466208.

The previous prime is 256166639. The next prime is 256166681. The reversal of 256166655 is 556661652.

It is not a de Polignac number, because 256166655 - 2⁴ = 256166639 is a prime.

It is a congruent number.

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, 4494 + ... + 23076.

It is an arithmetic number, because the mean of its divisors is an integer number (25645920).

Almost surely, 2^256166655 is an apocalyptic number.

256166655 is a deficient number, since it is larger than the sum of its proper divisors (154168065).

256166655 is a wasteful number, since it uses less digits than its factorization.

256166655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19510.

The product of its digits is 324000, while the sum is 42.

The square root of 256166655 is about 16005.2071214339. The cubic root of 256166655 is about 635.0981764833.

The spelling of 256166655 in words is "two hundred fifty-six million, one hundred sixty-six thousand, six hundred fifty-five".