18516478383720 has 192 divisors, whose sum is σ = 63574538976000. Its totient is φ = 4660959158784.

The previous prime is 18516478383691. The next prime is 18516478383721. The reversal of 18516478383720 is 2738387461581.

It is a happy number.

18516478383720 is a `hidden beast` number, since 1 + 8 + 5 + 16 + 478 + 3 + 83 + 72 + 0 = 666.

It is a super-2 number, since 2×18516478383720² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18516478383721) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2991760 + ... + 6781119.

It is an arithmetic number, because the mean of its divisors is an integer number (331117390500).

Almost surely, 2^{18516478383720} is an apocalyptic number.

18516478383720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18516478383720 is an abundant number, since it is smaller than the sum of its proper divisors (45058060592280).

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

18516478383720 is a wasteful number, since it uses less digits than its factorization.

18516478383720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9773192 (or 9773185 counting only the distinct ones).

The product of its (nonzero) digits is 54190080, while the sum is 63.

The spelling of 18516478383720 in words is "eighteen trillion, five hundred sixteen billion, four hundred seventy-eight million, three hundred eighty-three thousand, seven hundred twenty".