3165564221 has 4 divisors (see below), whose sum is σ = 3303197472. Its totient is φ = 3027930972.

The previous prime is 3165564197. The next prime is 3165564247. The reversal of 3165564221 is 1224655613.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3165564221 - 2²⁶ = 3098455357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3165564421) 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, 68816591 + ... + 68816636.

It is an arithmetic number, because the mean of its divisors is an integer number (825799368).

Almost surely, 2^3165564221 is an apocalyptic number.

It is an amenable number.

3165564221 is a deficient number, since it is larger than the sum of its proper divisors (137633251).

3165564221 is a wasteful number, since it uses less digits than its factorization.

3165564221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137633250.

The product of its digits is 43200, while the sum is 35.

The square root of 3165564221 is about 56263.3470476117. The cubic root of 3165564221 is about 1468.3075870322.

The spelling of 3165564221 in words is "three billion, one hundred sixty-five million, five hundred sixty-four thousand, two hundred twenty-one".