18136412388 has 72 divisors (see below), whose sum is σ = 46577643840. Its totient is φ = 5949155520.

The previous prime is 18136412377. The next prime is 18136412423. The reversal of 18136412388 is 88321463181.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1417323 + ... + 1430061.

It is an arithmetic number, because the mean of its divisors is an integer number (646911720).

Almost surely, 2^18136412388 is an apocalyptic number.

18136412388 is a gapful number since it is divisible by the number (18) 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 18136412388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23288821920).

18136412388 is an abundant number, since it is smaller than the sum of its proper divisors (28441231452).

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

18136412388 is a wasteful number, since it uses less digits than its factorization.

18136412388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13377 (or 13372 counting only the distinct ones).

The product of its digits is 221184, while the sum is 45.

The spelling of 18136412388 in words is "eighteen billion, one hundred thirty-six million, four hundred twelve thousand, three hundred eighty-eight".