18320913408 has 132 divisors (see below), whose sum is σ = 56804937792. Its totient is φ = 5234503680.

The previous prime is 18320913407. The next prime is 18320913409. The reversal of 18320913408 is 80431902381.

It is an interprime number because it is at equal distance from previous prime (18320913407) and next prime (18320913409).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18320913407) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 89673 + ... + 211383.

Almost surely, 2^18320913408 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 18320913408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28402468896).

18320913408 is an abundant number, since it is smaller than the sum of its proper divisors (38484024384).

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

18320913408 is a wasteful number, since it uses less digits than its factorization.

18320913408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121748 (or 121723 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 39.

The spelling of 18320913408 in words is "eighteen billion, three hundred twenty million, nine hundred thirteen thousand, four hundred eight".