18220259617 has 24 divisors (see below), whose sum is σ = 21412702080. Its totient is φ = 15457760640.

The previous prime is 18220259569. The next prime is 18220259639. The reversal of 18220259617 is 71695202281.

It is not a de Polignac number, because 18220259617 - 2⁷ = 18220259489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18220359617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1967484 + ... + 1976722.

It is an arithmetic number, because the mean of its divisors is an integer number (892195920).

Almost surely, 2^18220259617 is an apocalyptic number.

It is an amenable number.

18220259617 is a deficient number, since it is larger than the sum of its proper divisors (3192442463).

18220259617 is a wasteful number, since it uses less digits than its factorization.

18220259617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9661 (or 9654 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 43.

The spelling of 18220259617 in words is "eighteen billion, two hundred twenty million, two hundred fifty-nine thousand, six hundred seventeen".