66666000256 has 16 divisors (see below), whose sum is σ = 132811172640. Its totient is φ = 33333000064.

The previous prime is 66666000253. The next prime is 66666000281. The reversal of 66666000256 is 65200066666.

66666000256 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66666000253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260413936 + ... + 260414191.

It is an arithmetic number, because the mean of its divisors is an integer number (8300698290).

Almost surely, 2^66666000256 is an apocalyptic number.

66666000256 is the 163299-th centered pentagonal number.

It is an amenable number.

66666000256 is a deficient number, since it is larger than the sum of its proper divisors (66145172384).

66666000256 is an equidigital number, since it uses as much as digits as its factorization.

66666000256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520828141 (or 520828129 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 43.

The spelling of 66666000256 in words is "sixty-six billion, six hundred sixty-six million, two hundred fifty-six", and thus it is an aban number.