18723217138692 has 48 divisors (see below), whose sum is σ = 47716588315200. Its totient is φ = 5666858098560.

The previous prime is 18723217138673. The next prime is 18723217138693. The reversal of 18723217138692 is 29683171232781.

It is a happy number.

It is a hoax number, since the sum of its digits (60) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (18723217138693) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85440967 + ... + 85659822.

It is an arithmetic number, because the mean of its divisors is an integer number (994095589900).

Almost surely, 2^{18723217138692} is an apocalyptic number.

18723217138692 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18723217138692 is an abundant number, since it is smaller than the sum of its proper divisors (28993371176508).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18723217138692 is a wasteful number, since it uses less digits than its factorization.

18723217138692 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171101636 (or 171101634 counting only the distinct ones).

The product of its digits is 12192768, while the sum is 60.

The spelling of 18723217138692 in words is "eighteen trillion, seven hundred twenty-three billion, two hundred seventeen million, one hundred thirty-eight thousand, six hundred ninety-two".