18718717345749 has 6 divisors (see below), whose sum is σ = 27038147277206. Its totient is φ = 12479144897160.

The previous prime is 18718717345703. The next prime is 18718717345751. The reversal of 18718717345749 is 94754371781781.

18718717345749 is a `hidden beast` number, since 1 + 8 + 7 + 1 + 8 + 7 + 17 + 34 + 574 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 12666836902500 + 6051880443249 = 3559050^2 + 2460057^2 .

It is not a de Polignac number, because 18718717345749 - 2¹⁷ = 18718717214677 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 (18718717345789) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1039928741422 + ... + 1039928741439.

Almost surely, 2^{18718717345749} is an apocalyptic number.

It is an amenable number.

18718717345749 is a deficient number, since it is larger than the sum of its proper divisors (8319429931457).

18718717345749 is a wasteful number, since it uses less digits than its factorization.

18718717345749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2079857482867 (or 2079857482864 counting only the distinct ones).

The product of its digits is 331914240, while the sum is 72.

The spelling of 18718717345749 in words is "eighteen trillion, seven hundred eighteen billion, seven hundred seventeen million, three hundred forty-five thousand, seven hundred forty-nine".