66221946 has 24 divisors (see below), whose sum is σ = 163978464. Its totient is φ = 18920520.

The previous prime is 66221917. The next prime is 66221951. The reversal of 66221946 is 64912266.

It is a super-2 number, since 2×66221946² = 8770692264053832, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66221946.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 262660 + ... + 262911.

It is an arithmetic number, because the mean of its divisors is an integer number (6832436).

Almost surely, 2^66221946 is an apocalyptic number.

66221946 is an abundant number, since it is smaller than the sum of its proper divisors (97756518).

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

66221946 is a wasteful number, since it uses less digits than its factorization.

66221946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525586 (or 525583 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 66221946 is about 8137.6867720502. The cubic root of 66221946 is about 404.5764937388.

The spelling of 66221946 in words is "sixty-six million, two hundred twenty-one thousand, nine hundred forty-six".