666624202426666 has 12 divisors (see below), whose sum is σ = 1099103540365026. Its totient is φ = 303011001102920.

The previous prime is 666624202426643. The next prime is 666624202426673.

666624202426666 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in only one way, i.e., 666182994291441 + 441208135225 = 25810521^2 + 664235^2 .

It is a junction number, because it is equal to n+sod(n) for n = 666624202426598 and 666624202426607.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1377322732045 + ... + 1377322732528.

Almost surely, 2^{666624202426666} is an apocalyptic number.

666624202426666 is a deficient number, since it is larger than the sum of its proper divisors (432479337938360).

666624202426666 is a wasteful number, since it uses less digits than its factorization.

666624202426666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2754645464597 (or 2754645464586 counting only the distinct ones).

The product of its (nonzero) digits is 429981696, while the sum is 64.

The spelling of 666624202426666 in words is "six hundred sixty-six trillion, six hundred twenty-four billion, two hundred two million, four hundred twenty-six thousand, six hundred sixty-six".