66221160 has 32 divisors (see below), whose sum is σ = 198663840. Its totient is φ = 17658944.

The previous prime is 66221153. The next prime is 66221179. The reversal of 66221160 is 6112266.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 66221160.

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, 275802 + ... + 276041.

It is an arithmetic number, because the mean of its divisors is an integer number (6208245).

Almost surely, 2^66221160 is an apocalyptic number.

66221160 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66221160 is an abundant number, since it is smaller than the sum of its proper divisors (132442680).

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

66221160 is a wasteful number, since it uses less digits than its factorization.

66221160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 551857 (or 551853 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 66221160 is about 8137.6384780844. The cubic root of 66221160 is about 404.5748930691.

The spelling of 66221160 in words is "sixty-six million, two hundred twenty-one thousand, one hundred sixty".