18717205917319 has 12 divisors (see below), whose sum is σ = 23447928292824. Its totient is φ = 14809217868144.

The previous prime is 18717205917257. The next prime is 18717205917323. The reversal of 18717205917319 is 91371950271781.

It is not a de Polignac number, because 18717205917319 - 2²¹ = 18717203820167 is a prime.

It is a super-2 number, since 2×18717205917319² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18717205917359) 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, 14691683757 + ... + 14691685030.

It is an arithmetic number, because the mean of its divisors is an integer number (1953994024402).

Almost surely, 2^{18717205917319} is an apocalyptic number.

18717205917319 is a deficient number, since it is larger than the sum of its proper divisors (4730722375505).

18717205917319 is a wasteful number, since it uses less digits than its factorization.

18717205917319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29383368814 (or 29383368807 counting only the distinct ones).

The product of its (nonzero) digits is 6667920, while the sum is 61.

The spelling of 18717205917319 in words is "eighteen trillion, seven hundred seventeen billion, two hundred five million, nine hundred seventeen thousand, three hundred nineteen".