18915113369 has 4 divisors (see below), whose sum is σ = 18915436644. Its totient is φ = 18914790096.

The previous prime is 18915113341. The next prime is 18915113411. The reversal of 18915113369 is 96331151981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 96331151981 = 28229 ⋅3412489.

It can be written as a sum of positive squares in 2 ways, for example, as 16178568025 + 2736545344 = 127195^2 + 52312^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18915113369 is a prime.

It is a super-2 number, since 2×18915113369² (a number of 21 digits) contains 22 as substring.

It is a Duffinian 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 3 ways as a sum of consecutive naturals, for example, 46562 + ... + 199995.

It is an arithmetic number, because the mean of its divisors is an integer number (4728859161).

Almost surely, 2^18915113369 is an apocalyptic number.

It is an amenable number.

18915113369 is a deficient number, since it is larger than the sum of its proper divisors (323275).

18915113369 is an equidigital number, since it uses as much as digits as its factorization.

18915113369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323274.

The product of its digits is 174960, while the sum is 47.

The spelling of 18915113369 in words is "eighteen billion, nine hundred fifteen million, one hundred thirteen thousand, three hundred sixty-nine".