18139911534 has 48 divisors (see below), whose sum is σ = 41386250880. Its totient is φ = 5726382480.

The previous prime is 18139911529. The next prime is 18139911617. The reversal of 18139911534 is 43511993181.

18139911534 is a `hidden beast` number, since 1 + 8 + 13 + 99 + 11 + 534 = 666.

It is a super-2 number, since 2×18139911534² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18139911534.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1193209 + ... + 1208315.

It is an arithmetic number, because the mean of its divisors is an integer number (862213560).

Almost surely, 2^18139911534 is an apocalyptic number.

18139911534 is an abundant number, since it is smaller than the sum of its proper divisors (23246339346).

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

18139911534 is a wasteful number, since it uses less digits than its factorization.

18139911534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18645 (or 18642 counting only the distinct ones).

The product of its digits is 116640, while the sum is 45.

The spelling of 18139911534 in words is "eighteen billion, one hundred thirty-nine million, nine hundred eleven thousand, five hundred thirty-four".