256213166 has 16 divisors (see below), whose sum is σ = 419534208. Its totient is φ = 116383800.

The previous prime is 256213163. The next prime is 256213187. The reversal of 256213166 is 661312652.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256213163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43031 + ... + 48621.

It is an arithmetic number, because the mean of its divisors is an integer number (26220888).

Almost surely, 2^256213166 is an apocalyptic number.

256213166 is a deficient number, since it is larger than the sum of its proper divisors (163321042).

256213166 is a wasteful number, since it uses less digits than its factorization.

256213166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7687.

The product of its digits is 12960, while the sum is 32.

The square root of 256213166 is about 16006.6600513661. The cubic root of 256213166 is about 635.1366114411.

The spelling of 256213166 in words is "two hundred fifty-six million, two hundred thirteen thousand, one hundred sixty-six".