22664181 has 4 divisors (see below), whose sum is σ = 30218912. Its totient is φ = 15109452.

The previous prime is 22664153. The next prime is 22664189. The reversal of 22664181 is 18146622.

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 de Polignac number, because none of the positive numbers 2^k-22664181 is a prime.

It is a super-2 number, since 2×22664181² = 1027330200801522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22664189) 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, 3777361 + ... + 3777366.

It is an arithmetic number, because the mean of its divisors is an integer number (7554728).

Almost surely, 2^22664181 is an apocalyptic number.

It is an amenable number.

22664181 is a deficient number, since it is larger than the sum of its proper divisors (7554731).

22664181 is an equidigital number, since it uses as much as digits as its factorization.

22664181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7554730.

The product of its digits is 4608, while the sum is 30.

The square root of 22664181 is about 4760.6912313235. The cubic root of 22664181 is about 282.9958129294.

The spelling of 22664181 in words is "twenty-two million, six hundred sixty-four thousand, one hundred eighty-one".