18318989064 has 64 divisors (see below), whose sum is σ = 48519432000. Its totient is φ = 5743816704.

The previous prime is 18318989027. The next prime is 18318989069. The reversal of 18318989064 is 46098981381.

It is a junction number, because it is equal to n+sod(n) for n = 18318988995 and 18318989013.

It is not an unprimeable number, because it can be changed into a prime (18318989069) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 749712 + ... + 773760.

It is an arithmetic number, because the mean of its divisors is an integer number (758116125).

Almost surely, 2^18318989064 is an apocalyptic number.

It is an amenable number.

18318989064 is an abundant number, since it is smaller than the sum of its proper divisors (30200442936).

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

18318989064 is a wasteful number, since it uses less digits than its factorization.

18318989064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25942 (or 25938 counting only the distinct ones).

The product of its (nonzero) digits is 2985984, while the sum is 57.

The spelling of 18318989064 in words is "eighteen billion, three hundred eighteen million, nine hundred eighty-nine thousand, sixty-four".