66221747740 has 24 divisors (see below), whose sum is σ = 139999003200. Its totient is φ = 26310921408.

The previous prime is 66221747731. The next prime is 66221747797. The reversal of 66221747740 is 4774712266.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11108052 + ... + 11114011.

It is an arithmetic number, because the mean of its divisors is an integer number (5833291800).

Almost surely, 2^66221747740 is an apocalyptic number.

It is an amenable number.

66221747740 is an abundant number, since it is smaller than the sum of its proper divisors (73777255460).

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

66221747740 is a wasteful number, since it uses less digits than its factorization.

66221747740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22222221 (or 22222219 counting only the distinct ones).

The product of its (nonzero) digits is 790272, while the sum is 46.

The spelling of 66221747740 in words is "sixty-six billion, two hundred twenty-one million, seven hundred forty-seven thousand, seven hundred forty".