66612888666 has 24 divisors (see below), whose sum is σ = 145053199200. Its totient is φ = 22092715656.

The previous prime is 66612888653. The next prime is 66612888701. The reversal of 66612888666 is 66688821666.

It is a super-2 number, since 2×66612888666² (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 11 ways as a sum of consecutive naturals, for example, 9294700 + ... + 9301863.

It is an arithmetic number, because the mean of its divisors is an integer number (6043883300).

Almost surely, 2^66612888666 is an apocalyptic number.

66612888666 is an abundant number, since it is smaller than the sum of its proper divisors (78440310534).

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

66612888666 is a wasteful number, since it uses less digits than its factorization.

66612888666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18596770 (or 18596767 counting only the distinct ones).

The product of its digits is 47775744, while the sum is 63.

The spelling of 66612888666 in words is "sixty-six billion, six hundred twelve million, eight hundred eighty-eight thousand, six hundred sixty-six".