66885221722 has 16 divisors (see below), whose sum is σ = 110947842432. Its totient is φ = 29985901920.

The previous prime is 66885221701. The next prime is 66885221731. The reversal of 66885221722 is 22712258866.

It is a happy number.

It is a super-2 number, since 2×66885221722² (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 7 ways as a sum of consecutive naturals, for example, 20821938 + ... + 20825149.

It is an arithmetic number, because the mean of its divisors is an integer number (6934240152).

Almost surely, 2^66885221722 is an apocalyptic number.

66885221722 is a deficient number, since it is larger than the sum of its proper divisors (44062620710).

66885221722 is a wasteful number, since it uses less digits than its factorization.

66885221722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41647173.

The product of its digits is 1290240, while the sum is 49.

The spelling of 66885221722 in words is "sixty-six billion, eight hundred eighty-five million, two hundred twenty-one thousand, seven hundred twenty-two".