18159976464 has 80 divisors (see below), whose sum is σ = 53784617088. Its totient is φ = 5172166656.

The previous prime is 18159976433. The next prime is 18159976477. The reversal of 18159976464 is 46467995181.

It is a junction number, because it is equal to n+sod(n) for n = 18159976398 and 18159976407.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21264 + ... + 191760.

Almost surely, 2^18159976464 is an apocalyptic number.

18159976464 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18159976464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26892308544).

18159976464 is an abundant number, since it is smaller than the sum of its proper divisors (35624640624).

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

18159976464 is a wasteful number, since it uses less digits than its factorization.

18159976464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170832 (or 170826 counting only the distinct ones).

The product of its digits is 13063680, while the sum is 60.

The spelling of 18159976464 in words is "eighteen billion, one hundred fifty-nine million, nine hundred seventy-six thousand, four hundred sixty-four".