256413166 has 4 divisors (see below), whose sum is σ = 384619752. Its totient is φ = 128206582.

The previous prime is 256413119. The next prime is 256413187. The reversal of 256413166 is 661314652.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64103290 + ... + 64103293.

It is an arithmetic number, because the mean of its divisors is an integer number (96154938).

Almost surely, 2^256413166 is an apocalyptic number.

256413166 is a deficient number, since it is larger than the sum of its proper divisors (128206586).

256413166 is a wasteful number, since it uses less digits than its factorization.

256413166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128206585.

The product of its digits is 25920, while the sum is 34.

The square root of 256413166 is about 16012.9062321616. The cubic root of 256413166 is about 635.3018310069.

The spelling of 256413166 in words is "two hundred fifty-six million, four hundred thirteen thousand, one hundred sixty-six".