18495633985920 has 3840 divisors, whose sum is σ = 89604649854720. Its totient is φ = 3589550899200.

The previous prime is 18495633985883. The next prime is 18495633985949. The reversal of 18495633985920 is 2958933659481.

It is a happy number.

18495633985920 is a `hidden beast` number, since 1 + 8 + 4 + 9 + 563 + 3 + 9 + 8 + 59 + 2 + 0 = 666.

It is a super-2 number, since 2×18495633985920² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 479 ways as a sum of consecutive naturals, for example, 26384641570 + ... + 26384642270.

It is an arithmetic number, because the mean of its divisors is an integer number (23334544233).

Almost surely, 2^{18495633985920} is an apocalyptic number.

18495633985920 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 18495633985920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44802324927360).

18495633985920 is an abundant number, since it is smaller than the sum of its proper divisors (71109015868800).

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

18495633985920 is a wasteful number, since it uses less digits than its factorization.

18495633985920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 823 (or 795 counting only the distinct ones).

The product of its (nonzero) digits is 503884800, while the sum is 72.

The spelling of 18495633985920 in words is "eighteen trillion, four hundred ninety-five billion, six hundred thirty-three million, nine hundred eighty-five thousand, nine hundred twenty".