66221410 has 16 divisors (see below), whose sum is σ = 119585016. Its totient is φ = 26402688.

The previous prime is 66221399. The next prime is 66221497. The reversal of 66221410 is 1412266.

It can be written as a sum of positive squares in 4 ways, for example, as 12243001 + 53978409 = 3499^2 + 7347^2 .

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, 7449 + ... + 13708.

Almost surely, 2^66221410 is an apocalyptic number.

66221410 is a deficient number, since it is larger than the sum of its proper divisors (53363606).

66221410 is a wasteful number, since it uses less digits than its factorization.

66221410 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21477.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 66221410 is about 8137.6538387916. The cubic root of 66221410 is about 404.5754021894.

Adding to 66221410 its reverse (1412266), we get a palindrome (67633676).

The spelling of 66221410 in words is "sixty-six million, two hundred twenty-one thousand, four hundred ten".