66101656900 has 18 divisors (see below), whose sum is σ = 143440595690. Its totient is φ = 26440662720.

The previous prime is 66101656897. The next prime is 66101656919. The reversal of 66101656900 is 965610166.

It can be written as a sum of positive squares in 3 ways, for example, as 8209447236 + 57892209664 = 90606^2 + 240608^2 .

It is a super-2 number, since 2×66101656900² (a number of 22 digits) contains 22 as substring.

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, 330508185 + ... + 330508384.

Almost surely, 2^66101656900 is an apocalyptic number.

It is an amenable number.

66101656900 is an abundant number, since it is smaller than the sum of its proper divisors (77338938790).

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

66101656900 is a wasteful number, since it uses less digits than its factorization.

66101656900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 661016583 (or 661016576 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 40.

The spelling of 66101656900 in words is "sixty-six billion, one hundred one million, six hundred fifty-six thousand, nine hundred".