66664656600 has 48 divisors (see below), whose sum is σ = 206660437320. Its totient is φ = 17777241600.

The previous prime is 66664656557. The next prime is 66664656629. The reversal of 66664656600 is 665646666.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 55553281 + ... + 55554480.

Almost surely, 2^66664656600 is an apocalyptic number.

66664656600 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66664656600 is an abundant number, since it is smaller than the sum of its proper divisors (139995780720).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66664656600 is a wasteful number, since it uses less digits than its factorization.

66664656600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111107780 (or 111107771 counting only the distinct ones).

The product of its (nonzero) digits is 5598720, while the sum is 51.

The spelling of 66664656600 in words is "sixty-six billion, six hundred sixty-four million, six hundred fifty-six thousand, six hundred".