18161987266176 has 256 divisors, whose sum is σ = 55763444096640. Its totient is φ = 5187529211904.

The previous prime is 18161987266153. The next prime is 18161987266207. The reversal of 18161987266176 is 67166278916181.

It is a self number, because there is not a number n which added to its sum of digits gives 18161987266176.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4729231 + ... + 7660913.

Almost surely, 2^{18161987266176} is an apocalyptic number.

18161987266176 is a gapful number since it is divisible by the number (16) 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 18161987266176, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27881722048320).

18161987266176 is an abundant number, since it is smaller than the sum of its proper divisors (37601456830464).

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

18161987266176 is a wasteful number, since it uses less digits than its factorization.

18161987266176 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2931803 (or 2931791 counting only the distinct ones).

The product of its digits is 73156608, while the sum is 69.

The spelling of 18161987266176 in words is "eighteen trillion, one hundred sixty-one billion, nine hundred eighty-seven million, two hundred sixty-six thousand, one hundred seventy-six".