18659997009216 has 336 divisors, whose sum is σ = 57280660444800. Its totient is φ = 5794888974336.

The previous prime is 18659997009211. The next prime is 18659997009223. The reversal of 18659997009216 is 61290079995681.

18659997009216 is a `hidden beast` number, since 1 + 8 + 6 + 599 + 9 + 7 + 0 + 0 + 9 + 21 + 6 = 666.

It is a super-3 number, since 3×18659997009216³ (a number of 41 digits) contains 333 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 not an unprimeable number, because it can be changed into a prime (18659997009211) 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, 78879720 + ... + 79115928.

Almost surely, 2^{18659997009216} is an apocalyptic number.

18659997009216 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 18659997009216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28640330222400).

18659997009216 is an abundant number, since it is smaller than the sum of its proper divisors (38620663435584).

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

18659997009216 is a wasteful number, since it uses less digits than its factorization.

18659997009216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236406 (or 236393 counting only the distinct ones).

The product of its (nonzero) digits is 132269760, while the sum is 72.

The spelling of 18659997009216 in words is "eighteen trillion, six hundred fifty-nine billion, nine hundred ninety-seven million, nine thousand, two hundred sixteen".