18317588645 has 6 divisors (see below), whose sum is σ = 21981469542. Its totient is φ = 14653828808.

The previous prime is 18317588617. The next prime is 18317588687. The reversal of 18317588645 is 54688571381.

It can be written as a sum of positive squares in only one way, i.e., 14654070916 + 3663517729 = 121054^2 + 60527^2 .

It is not a de Polignac number, because 18317588645 - 2¹⁶ = 18317523109 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 272372 + ... + 332898.

It is an arithmetic number, because the mean of its divisors is an integer number (3663578257).

Almost surely, 2^18317588645 is an apocalyptic number.

It is an amenable number.

18317588645 is a deficient number, since it is larger than the sum of its proper divisors (3663880897).

18317588645 is an frugal number, since it uses more digits than its factorization.

18317588645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121059 (or 60532 counting only the distinct ones).

The product of its digits is 6451200, while the sum is 56.

The spelling of 18317588645 in words is "eighteen billion, three hundred seventeen million, five hundred eighty-eight thousand, six hundred forty-five".