256331066 has 8 divisors (see below), whose sum is σ = 407114100. Its totient is φ = 120626368.

The previous prime is 256331059. The next prime is 256331093. The reversal of 256331066 is 660133652.

256331066 = T₅₄₈₃ + T₅₄₈₄ + ... + T₅₄₉₉.

It can be written as a sum of positive squares in 2 ways, for example, as 250304041 + 6027025 = 15821^2 + 2455^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3769541 + ... + 3769608.

Almost surely, 2^256331066 is an apocalyptic number.

256331066 is a deficient number, since it is larger than the sum of its proper divisors (150783034).

256331066 is a wasteful number, since it uses less digits than its factorization.

256331066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7539168.

The product of its (nonzero) digits is 19440, while the sum is 32.

The square root of 256331066 is about 16010.3424697912. The cubic root of 256331066 is about 635.2340187739.

The spelling of 256331066 in words is "two hundred fifty-six million, three hundred thirty-one thousand, sixty-six".