256666804 has 12 divisors (see below), whose sum is σ = 452182500. Its totient is φ = 127471808.

The previous prime is 256666789. The next prime is 256666807. The reversal of 256666804 is 408666652.

It can be written as a sum of positive squares in 2 ways, for example, as 53319204 + 203347600 = 7302^2 + 14260^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256666807) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 214729 + ... + 215920.

It is an arithmetic number, because the mean of its divisors is an integer number (37681875).

Almost surely, 2^256666804 is an apocalyptic number.

It is an amenable number.

256666804 is a deficient number, since it is larger than the sum of its proper divisors (195515696).

256666804 is a wasteful number, since it uses less digits than its factorization.

256666804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430802 (or 430800 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 43.

The square root of 256666804 is about 16020.8240736861. The cubic root of 256666804 is about 635.5112372900.

The spelling of 256666804 in words is "two hundred fifty-six million, six hundred sixty-six thousand, eight hundred four".