66556500672 has 28 divisors (see below), whose sum is σ = 176097408536. Its totient is φ = 22185500160.

The previous prime is 66556500667. The next prime is 66556500679. The reversal of 66556500672 is 27600565566.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (66556500679) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 173324029 + ... + 173324412.

It is an arithmetic number, because the mean of its divisors is an integer number (6289193162).

Almost surely, 2^66556500672 is an apocalyptic number.

It is an amenable number.

66556500672 is an abundant number, since it is smaller than the sum of its proper divisors (109540907864).

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

66556500672 is a wasteful number, since it uses less digits than its factorization.

66556500672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346648456 (or 346648446 counting only the distinct ones).

The product of its (nonzero) digits is 2268000, while the sum is 48.

The spelling of 66556500672 in words is "sixty-six billion, five hundred fifty-six million, five hundred thousand, six hundred seventy-two".