66221635326 has 64 divisors (see below), whose sum is σ = 165171018240. Its totient is φ = 17195535360.

The previous prime is 66221635307. The next prime is 66221635357. The reversal of 66221635326 is 62353612266.

It is a super-2 number, since 2×66221635326² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1778290 + ... + 1815146.

It is an arithmetic number, because the mean of its divisors is an integer number (2580797160).

Almost surely, 2^66221635326 is an apocalyptic number.

66221635326 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

66221635326 is an abundant number, since it is smaller than the sum of its proper divisors (98949382914).

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

66221635326 is a wasteful number, since it uses less digits than its factorization.

66221635326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40769.

The product of its digits is 466560, while the sum is 42.

The spelling of 66221635326 in words is "sixty-six billion, two hundred twenty-one million, six hundred thirty-five thousand, three hundred twenty-six".