18380563317 has 12 divisors (see below), whose sum is σ = 26551506124. Its totient is φ = 12252876480.

The previous prime is 18380563309. The next prime is 18380563339. The reversal of 18380563317 is 71336508381.

18380563317 is a `hidden beast` number, since 1 + 8 + 3 + 8 + 0 + 5 + 633 + 1 + 7 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 13463889156 + 4916674161 = 116034^2 + 70119^2 .

It is not a de Polignac number, because 18380563317 - 2³ = 18380563309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18380563417) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 89673 + ... + 211665.

Almost surely, 2^18380563317 is an apocalyptic number.

It is an amenable number.

18380563317 is a deficient number, since it is larger than the sum of its proper divisors (8170942807).

18380563317 is a wasteful number, since it uses less digits than its factorization.

18380563317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138740 (or 138737 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The spelling of 18380563317 in words is "eighteen billion, three hundred eighty million, five hundred sixty-three thousand, three hundred seventeen".