66221752686 has 32 divisors (see below), whose sum is σ = 135735989760. Its totient is φ = 21531903744.

The previous prime is 66221752661. The next prime is 66221752687. The reversal of 66221752686 is 68625712266.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66221752687) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 802275 + ... + 880958.

It is an arithmetic number, because the mean of its divisors is an integer number (4241749680).

Almost surely, 2^66221752686 is an apocalyptic number.

66221752686 is an abundant number, since it is smaller than the sum of its proper divisors (69514237074).

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

66221752686 is a wasteful number, since it uses less digits than its factorization.

66221752686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1683400.

The product of its digits is 2903040, while the sum is 51.

The spelling of 66221752686 in words is "sixty-six billion, two hundred twenty-one million, seven hundred fifty-two thousand, six hundred eighty-six".