18308939120640 has 1008 divisors, whose sum is σ = 75261481346688. Its totient is φ = 4182861938688.

The previous prime is 18308939120639. The next prime is 18308939120653. The reversal of 18308939120640 is 4602193980381.

18308939120640 is a `hidden beast` number, since 1 + 8 + 3 + 0 + 8 + 9 + 391 + 206 + 40 = 666.

It is a tau number, because it is divible by the number of its divisors (1008).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8918137854 + ... + 8918139906.

Almost surely, 2^{18308939120640} is an apocalyptic number.

18308939120640 is a gapful number since it is divisible by the number (10) 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 18308939120640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37630740673344).

18308939120640 is an abundant number, since it is smaller than the sum of its proper divisors (56952542226048).

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

18308939120640 is an frugal number, since it uses more digits than its factorization.

18308939120640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2120 (or 2070 counting only the distinct ones).

The product of its (nonzero) digits is 2239488, while the sum is 54.

The spelling of 18308939120640 in words is "eighteen trillion, three hundred eight billion, nine hundred thirty-nine million, one hundred twenty thousand, six hundred forty".