256004666 has 16 divisors (see below), whose sum is σ = 406892160. Its totient is φ = 120384960.

The previous prime is 256004653. The next prime is 256004711. The reversal of 256004666 is 666400652.

It is an unprimeable number.

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, 89405 + ... + 92223.

It is an arithmetic number, because the mean of its divisors is an integer number (25430760).

Almost surely, 2^256004666 is an apocalyptic number.

256004666 is a deficient number, since it is larger than the sum of its proper divisors (150887494).

256004666 is a wasteful number, since it uses less digits than its factorization.

256004666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5509.

The product of its (nonzero) digits is 51840, while the sum is 35.

The square root of 256004666 is about 16000.1458118356. The cubic root of 256004666 is about 634.9642784791.

The spelling of 256004666 in words is "two hundred fifty-six million, four thousand, six hundred sixty-six".