18919439534016 has 168 divisors, whose sum is σ = 62249205732480. Its totient is φ = 5381740878336.

The previous prime is 18919439533991. The next prime is 18919439534027. The reversal of 18919439534016 is 61043593491981.

18919439534016 is a `hidden beast` number, since 1 + 8 + 9 + 1 + 94 + 3 + 9 + 534 + 0 + 1 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (168).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9420246 + ... + 11250773.

Almost surely, 2^{18919439534016} is an apocalyptic number.

18919439534016 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18919439534016 is an abundant number, since it is smaller than the sum of its proper divisors (43329766198464).

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

18919439534016 is a wasteful number, since it uses less digits than its factorization.

18919439534016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20671271 (or 20671258 counting only the distinct ones).

The product of its (nonzero) digits is 25194240, while the sum is 63.

The spelling of 18919439534016 in words is "eighteen trillion, nine hundred nineteen billion, four hundred thirty-nine million, five hundred thirty-four thousand, sixteen".