18688720036717 has 8 divisors (see below), whose sum is σ = 18968736224672. Its totient is φ = 18408735615600.

The previous prime is 18688720036711. The next prime is 18688720036787. The reversal of 18688720036717 is 71763002788681.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18688720036717 is a prime.

It is a super-2 number, since 2×18688720036717² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18688720036711) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6754959 + ... + 9110812.

It is an arithmetic number, because the mean of its divisors is an integer number (2371092028084).

Almost surely, 2^{18688720036717} is an apocalyptic number.

It is an amenable number.

18688720036717 is a deficient number, since it is larger than the sum of its proper divisors (280016187955).

18688720036717 is a wasteful number, since it uses less digits than its factorization.

18688720036717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15883419.

The product of its (nonzero) digits is 37933056, while the sum is 64.

The spelling of 18688720036717 in words is "eighteen trillion, six hundred eighty-eight billion, seven hundred twenty million, thirty-six thousand, seven hundred seventeen".