222566165 has 4 divisors (see below), whose sum is σ = 267079404. Its totient is φ = 178052928.

The previous prime is 222566131. The next prime is 222566191. The reversal of 222566165 is 561665222.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 561665222 = 2 ⋅280832611.

It can be written as a sum of positive squares in 2 ways, for example, as 42523441 + 180042724 = 6521^2 + 13418^2 .

It is a cyclic number.

It is not a de Polignac number, because 222566165 - 2⁸ = 222565909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22256612 + ... + 22256621.

It is an arithmetic number, because the mean of its divisors is an integer number (66769851).

Almost surely, 2^222566165 is an apocalyptic number.

It is an amenable number.

222566165 is a deficient number, since it is larger than the sum of its proper divisors (44513239).

222566165 is an equidigital number, since it uses as much as digits as its factorization.

222566165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44513238.

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

The square root of 222566165 is about 14918.6515811584. The cubic root of 222566165 is about 606.0191959486.

The spelling of 222566165 in words is "two hundred twenty-two million, five hundred sixty-six thousand, one hundred sixty-five".