18099956393784 has 48 divisors (see below), whose sum is σ = 49021306350120. Its totient is φ = 6033246045120.

The previous prime is 18099956393677. The next prime is 18099956393801. The reversal of 18099956393784 is 48739365999081.

18099956393784 is a `hidden beast` number, since 1 + 80 + 9 + 99 + 56 + 39 + 378 + 4 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4670814 + ... + 7616850.

Almost surely, 2^{18099956393784} is an apocalyptic number.

It is an amenable number.

18099956393784 is an abundant number, since it is smaller than the sum of its proper divisors (30921349956336).

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

18099956393784 is a wasteful number, since it uses less digits than its factorization.

18099956393784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3031380 (or 3031373 counting only the distinct ones).

The product of its (nonzero) digits is 3174474240, while the sum is 81.

The spelling of 18099956393784 in words is "eighteen trillion, ninety-nine billion, nine hundred fifty-six million, three hundred ninety-three thousand, seven hundred eighty-four".