66222139 has 4 divisors (see below), whose sum is σ = 66536200. Its totient is φ = 65908080.

The previous prime is 66222133. The next prime is 66222199. The reversal of 66222139 is 93122266.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66222139 - 2⁹ = 66221627 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66222139.

It is not an unprimeable number, because it can be changed into a prime (66222133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 156714 + ... + 157135.

It is an arithmetic number, because the mean of its divisors is an integer number (16634050).

Almost surely, 2^66222139 is an apocalyptic number.

66222139 is a deficient number, since it is larger than the sum of its proper divisors (314061).

66222139 is a wasteful number, since it uses less digits than its factorization.

66222139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314060.

The product of its digits is 7776, while the sum is 31.

The square root of 66222139 is about 8137.6986304483. The cubic root of 66222139 is about 404.5768867766.

It can be divided in two parts, 662 and 22139, that added together give a square (22801 = 151²).

The spelling of 66222139 in words is "sixty-six million, two hundred twenty-two thousand, one hundred thirty-nine".