18318970117215 has 12 divisors (see below), whose sum is σ = 31752881536584. Its totient is φ = 9770117395824.

The previous prime is 18318970117207. The next prime is 18318970117243. The reversal of 18318970117215 is 51271107981381.

18318970117215 is a `hidden beast` number, since 18 + 318 + 97 + 0 + 1 + 17 + 215 = 666.

It is not a de Polignac number, because 18318970117215 - 2³ = 18318970117207 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 203544112369 + ... + 203544112458.

It is an arithmetic number, because the mean of its divisors is an integer number (2646073461382).

Almost surely, 2^{18318970117215} is an apocalyptic number.

18318970117215 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18318970117215 is a deficient number, since it is larger than the sum of its proper divisors (13433911419369).

18318970117215 is a wasteful number, since it uses less digits than its factorization.

18318970117215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407088224838 (or 407088224835 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 54.

The spelling of 18318970117215 in words is "eighteen trillion, three hundred eighteen billion, nine hundred seventy million, one hundred seventeen thousand, two hundred fifteen".