18915113389 has 8 divisors (see below), whose sum is σ = 19423850040. Its totient is φ = 18408633600.

The previous prime is 18915113341. The next prime is 18915113411. The reversal of 18915113389 is 98331151981.

It can be written as a sum of positive squares in 4 ways, for example, as 4360621225 + 14554492164 = 66035^2 + 120642^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 18915113389 - 2¹⁹ = 18914589101 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18915113309) 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, 547222 + ... + 580759.

It is an arithmetic number, because the mean of its divisors is an integer number (2427981255).

Almost surely, 2^18915113389 is an apocalyptic number.

It is an amenable number.

18915113389 is a deficient number, since it is larger than the sum of its proper divisors (508736651).

18915113389 is a wasteful number, since it uses less digits than its factorization.

18915113389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1128431.

The product of its digits is 233280, while the sum is 49.

The spelling of 18915113389 in words is "eighteen billion, nine hundred fifteen million, one hundred thirteen thousand, three hundred eighty-nine".