18115012608 has 432 divisors, whose sum is σ = 61713681120. Its totient is φ = 4625448960.

The previous prime is 18115012583. The next prime is 18115012613. The reversal of 18115012608 is 80621051181.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 307034083 + ... + 307034141.

Almost surely, 2^18115012608 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18115012608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30856840560).

18115012608 is an abundant number, since it is smaller than the sum of its proper divisors (43598668512).

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

18115012608 is an equidigital number, since it uses as much as digits as its factorization.

18115012608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172 (or 82 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 33.

Adding to 18115012608 its reverse (80621051181), we get a palindrome (98736063789).

The spelling of 18115012608 in words is "eighteen billion, one hundred fifteen million, twelve thousand, six hundred eight".