66221707167 has 64 divisors (see below), whose sum is σ = 123525688320. Its totient is φ = 34060176000.

The previous prime is 66221707159. The next prime is 66221707187. The reversal of 66221707167 is 76170712266.

66221707167 is a `hidden beast` number, since 6 + 622 + 1 + 7 + 0 + 7 + 16 + 7 = 666.

It is not a de Polignac number, because 66221707167 - 2³ = 66221707159 is a prime.

It is a super-2 number, since 2×66221707167² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66221707187) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 52293 + ... + 367665.

It is an arithmetic number, because the mean of its divisors is an integer number (1930088880).

Almost surely, 2^66221707167 is an apocalyptic number.

66221707167 is a deficient number, since it is larger than the sum of its proper divisors (57303981153).

66221707167 is a wasteful number, since it uses less digits than its factorization.

66221707167 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315501 (or 315495 counting only the distinct ones).

The product of its (nonzero) digits is 296352, while the sum is 45.

The spelling of 66221707167 in words is "sixty-six billion, two hundred twenty-one million, seven hundred seven thousand, one hundred sixty-seven".