22517972891 has 4 divisors (see below), whose sum is σ = 23067191784. Its totient is φ = 21968754000.

The previous prime is 22517972879. The next prime is 22517972941. The reversal of 22517972891 is 19827971522.

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 22517972891 - 2²² = 22513778587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22517972821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 274609385 + ... + 274609466.

It is an arithmetic number, because the mean of its divisors is an integer number (5766797946).

Almost surely, 2^22517972891 is an apocalyptic number.

22517972891 is a deficient number, since it is larger than the sum of its proper divisors (549218893).

22517972891 is an equidigital number, since it uses as much as digits as its factorization.

22517972891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 549218892.

The product of its digits is 1270080, while the sum is 53.

The spelling of 22517972891 in words is "twenty-two billion, five hundred seventeen million, nine hundred seventy-two thousand, eight hundred ninety-one".