66222015 has 16 divisors (see below), whose sum is σ = 106062048. Its totient is φ = 35282816.

The previous prime is 66221977. The next prime is 66222019. The reversal of 66222015 is 51022266.

It is a cyclic number.

It is not a de Polignac number, because 66222015 - 2⁶ = 66221951 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66222019) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20917 + ... + 23873.

It is an arithmetic number, because the mean of its divisors is an integer number (6628878).

Almost surely, 2^66222015 is an apocalyptic number.

66222015 is a deficient number, since it is larger than the sum of its proper divisors (39840033).

66222015 is a wasteful number, since it uses less digits than its factorization.

66222015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4458.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 66222015 is about 8137.6910115831. The cubic root of 66222015 is about 404.5766342550.

The spelling of 66222015 in words is "sixty-six million, two hundred twenty-two thousand, fifteen".