18517392072 has 256 divisors, whose sum is σ = 54136320000. Its totient is φ = 5859060480.

The previous prime is 18517392071. The next prime is 18517392083. The reversal of 18517392072 is 27029371581.

18517392072 is a `hidden beast` number, since 18 + 517 + 39 + 20 + 72 = 666.

It is not an unprimeable number, because it can be changed into a prime (18517392071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 87760047 + ... + 87760257.

It is an arithmetic number, because the mean of its divisors is an integer number (211470000).

Almost surely, 2^18517392072 is an apocalyptic number.

18517392072 is a gapful number since it is divisible by the number (12) 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 18517392072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27068160000).

18517392072 is an abundant number, since it is smaller than the sum of its proper divisors (35618927928).

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

18517392072 is a wasteful number, since it uses less digits than its factorization.

18517392072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 481 (or 471 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 45.

The spelling of 18517392072 in words is "eighteen billion, five hundred seventeen million, three hundred ninety-two thousand, seventy-two".