18722220517 has 24 divisors (see below), whose sum is σ = 25586420832. Its totient is φ = 13466527200.

The previous prime is 18722220487. The next prime is 18722220529. The reversal of 18722220517 is 71502222781.

It is not a de Polignac number, because 18722220517 - 2⁷ = 18722220389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18722221517) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1328959 + ... + 1342972.

It is an arithmetic number, because the mean of its divisors is an integer number (1066100868).

Almost surely, 2^18722220517 is an apocalyptic number.

It is an amenable number.

18722220517 is a deficient number, since it is larger than the sum of its proper divisors (6864200315).

18722220517 is a wasteful number, since it uses less digits than its factorization.

18722220517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2671969 (or 2671962 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 37.

The spelling of 18722220517 in words is "eighteen billion, seven hundred twenty-two million, two hundred twenty thousand, five hundred seventeen".