22506818231 has 4 divisors (see below), whose sum is σ = 22985686752. Its totient is φ = 22027949712.

The previous prime is 22506818227. The next prime is 22506818237. The reversal of 22506818231 is 13281860522.

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

It is a cyclic number.

It is not a de Polignac number, because 22506818231 - 2² = 22506818227 is a prime.

It is a super-2 number, since 2×22506818231² (a number of 22 digits) 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 (22506818237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 239434190 + ... + 239434283.

It is an arithmetic number, because the mean of its divisors is an integer number (5746421688).

Almost surely, 2^22506818231 is an apocalyptic number.

22506818231 is a deficient number, since it is larger than the sum of its proper divisors (478868521).

22506818231 is an equidigital number, since it uses as much as digits as its factorization.

22506818231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 478868520.

The product of its (nonzero) digits is 46080, while the sum is 38.

The spelling of 22506818231 in words is "twenty-two billion, five hundred six million, eight hundred eighteen thousand, two hundred thirty-one".