66660621200 has 30 divisors (see below), whose sum is σ = 160152143394. Its totient is φ = 26664248320.

The previous prime is 66660621199. The next prime is 66660621211. The reversal of 66660621200 is 212606666.

It can be written as a sum of positive squares in 3 ways, for example, as 1097994496 + 65562626704 = 33136^2 + 256052^2 .

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, 83325377 + ... + 83326176.

Almost surely, 2^66660621200 is an apocalyptic number.

It is an amenable number.

66660621200 is an abundant number, since it is smaller than the sum of its proper divisors (93491522194).

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

66660621200 is a wasteful number, since it uses less digits than its factorization.

66660621200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166651571 (or 166651560 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 35.

The spelling of 66660621200 in words is "sixty-six billion, six hundred sixty million, six hundred twenty-one thousand, two hundred".