18138702216492 has 384 divisors, whose sum is σ = 58626892800000. Its totient is φ = 4770901935360.

The previous prime is 18138702216421. The next prime is 18138702216493. The reversal of 18138702216492 is 29461220783181.

18138702216492 is a `hidden beast` number, since 1 + 8 + 1 + 387 + 0 + 2 + 216 + 49 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (18138702216493) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 20524759 + ... + 21390257.

It is an arithmetic number, because the mean of its divisors is an integer number (152674200000).

Almost surely, 2^{18138702216492} is an apocalyptic number.

18138702216492 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 18138702216492, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29313446400000).

18138702216492 is an abundant number, since it is smaller than the sum of its proper divisors (40488190583508).

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

18138702216492 is a wasteful number, since it uses less digits than its factorization.

18138702216492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 865618 (or 865610 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 54.

The spelling of 18138702216492 in words is "eighteen trillion, one hundred thirty-eight billion, seven hundred two million, two hundred sixteen thousand, four hundred ninety-two".