66221580776136 has 64 divisors (see below), whose sum is σ = 171268432171200. Its totient is φ = 21311980435200.

The previous prime is 66221580776017. The next prime is 66221580776149. The reversal of 66221580776136 is 63167708512266.

66221580776136 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 66221580776136.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19452166 + ... + 22601546.

It is an arithmetic number, because the mean of its divisors is an integer number (2676069252675).

Almost surely, 2^{66221580776136} is an apocalyptic number.

It is an amenable number.

66221580776136 is an abundant number, since it is smaller than the sum of its proper divisors (105046851395064).

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

66221580776136 is a wasteful number, since it uses less digits than its factorization.

66221580776136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3179630 (or 3179626 counting only the distinct ones).

The product of its (nonzero) digits is 30481920, while the sum is 60.

The spelling of 66221580776136 in words is "sixty-six trillion, two hundred twenty-one billion, five hundred eighty million, seven hundred seventy-six thousand, one hundred thirty-six".