66566166004 has 12 divisors (see below), whose sum is σ = 125451620644. Its totient is φ = 30722845824.

The previous prime is 66566165977. The next prime is 66566166031. The reversal of 66566166004 is 40066166566.

It is an interprime number because it is at equal distance from previous prime (66566165977) and next prime (66566166031).

It can be written as a sum of positive squares in 2 ways, for example, as 28442822500 + 38123343504 = 168650^2 + 195252^2 .

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is a congruent 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, 640059237 + ... + 640059340.

Almost surely, 2^66566166004 is an apocalyptic number.

It is an amenable number.

66566166004 is a deficient number, since it is larger than the sum of its proper divisors (58885454640).

66566166004 is a wasteful number, since it uses less digits than its factorization.

66566166004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1280118594 (or 1280118592 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 46.

The spelling of 66566166004 in words is "sixty-six billion, five hundred sixty-six million, one hundred sixty-six thousand, four".