18603814993920 has 1680 divisors, whose sum is σ = 74512145417472. Its totient is φ = 4425944924160.

The previous prime is 18603814993901. The next prime is 18603814993921. The reversal of 18603814993920 is 2939941830681.

18603814993920 is a `hidden beast` number, since 1 + 8 + 60 + 3 + 81 + 499 + 3 + 9 + 2 + 0 = 666.

It is a super-2 number, since 2×18603814993920² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18603814993921) by changing a digit.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 24067030654 + ... + 24067031426.

Almost surely, 2^{18603814993920} is an apocalyptic number.

18603814993920 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 18603814993920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37256072708736).

18603814993920 is an abundant number, since it is smaller than the sum of its proper divisors (55908330423552).

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

18603814993920 is an frugal number, since it uses more digits than its factorization.

18603814993920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 868 (or 827 counting only the distinct ones).

The product of its (nonzero) digits is 20155392, while the sum is 63.

The spelling of 18603814993920 in words is "eighteen trillion, six hundred three billion, eight hundred fourteen million, nine hundred ninety-three thousand, nine hundred twenty".