66221404 has 6 divisors (see below), whose sum is σ = 115887464. Its totient is φ = 33110700.

The previous prime is 66221399. The next prime is 66221497. The reversal of 66221404 is 40412266.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8277672 + ... + 8277679.

Almost surely, 2^66221404 is an apocalyptic number.

It is an amenable number.

66221404 is a deficient number, since it is larger than the sum of its proper divisors (49666060).

66221404 is a wasteful number, since it uses less digits than its factorization.

66221404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16555355 (or 16555353 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 66221404 is about 8137.6534701350. The cubic root of 66221404 is about 404.5753899705.

The spelling of 66221404 in words is "sixty-six million, two hundred twenty-one thousand, four hundred four".