66222017 has 4 divisors (see below), whose sum is σ = 66239940. Its totient is φ = 66204096.

The previous prime is 66221977. The next prime is 66222019. The reversal of 66222017 is 71022266.

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

It can be written as a sum of positive squares in 2 ways, for example, as 63984001 + 2238016 = 7999^2 + 1496^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66222017 is a prime.

It is a Duffinian 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 3 ways as a sum of consecutive naturals, for example, 1148 + ... + 11565.

It is an arithmetic number, because the mean of its divisors is an integer number (16559985).

Almost surely, 2^66222017 is an apocalyptic number.

It is an amenable number.

66222017 is a deficient number, since it is larger than the sum of its proper divisors (17923).

66222017 is a wasteful number, since it uses less digits than its factorization.

66222017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17922.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 66222017 is about 8137.6911344681. The cubic root of 66222017 is about 404.5766383280.

The spelling of 66222017 in words is "sixty-six million, two hundred twenty-two thousand, seventeen".