18857172373389 has 32 divisors (see below), whose sum is σ = 31928607223040. Its totient is φ = 10775149203456.

The previous prime is 18857172373379. The next prime is 18857172373411. The reversal of 18857172373389 is 98337327175881.

It is a happy number.

18857172373389 is a `hidden beast` number, since 1 + 8 + 8 + 5 + 7 + 1 + 7 + 237 + 3 + 389 = 666.

It is not a de Polignac number, because 18857172373389 - 2²³ = 18857163984781 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 (18857172373309) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3699309 + ... + 7169325.

It is an arithmetic number, because the mean of its divisors is an integer number (997768975720).

Almost surely, 2^{18857172373389} is an apocalyptic number.

It is an amenable number.

18857172373389 is a deficient number, since it is larger than the sum of its proper divisors (13071434849651).

18857172373389 is a wasteful number, since it uses less digits than its factorization.

18857172373389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3498786 (or 3498780 counting only the distinct ones).

The product of its digits is 426746880, while the sum is 72.

The spelling of 18857172373389 in words is "eighteen trillion, eight hundred fifty-seven billion, one hundred seventy-two million, three hundred seventy-three thousand, three hundred eighty-nine".