18383738291091 has 6 divisors (see below), whose sum is σ = 26554288642700. Its totient is φ = 12255825527388.

The previous prime is 18383738291089. The next prime is 18383738291101. The reversal of 18383738291091 is 19019283738381.

18383738291091 is a `hidden beast` number, since 1 + 8 + 3 + 83 + 7 + 382 + 91 + 0 + 91 = 666.

It is not a de Polignac number, because 18383738291091 - 2¹ = 18383738291089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18383738291041) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1021318793941 + ... + 1021318793958.

Almost surely, 2^{18383738291091} is an apocalyptic number.

18383738291091 is a deficient number, since it is larger than the sum of its proper divisors (8170550351609).

18383738291091 is a wasteful number, since it uses less digits than its factorization.

18383738291091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2042637587905 (or 2042637587902 counting only the distinct ones).

The product of its (nonzero) digits is 15676416, while the sum is 63.

The spelling of 18383738291091 in words is "eighteen trillion, three hundred eighty-three billion, seven hundred thirty-eight million, two hundred ninety-one thousand, ninety-one".