18391514834 has 32 divisors (see below), whose sum is σ = 34401096576. Its totient is φ = 7164155520.

The previous prime is 18391514831. The next prime is 18391514879. The reversal of 18391514834 is 43841519381.

It is not an unprimeable number, because it can be changed into a prime (18391514831) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1242662 + ... + 1257374.

It is an arithmetic number, because the mean of its divisors is an integer number (1075034268).

Almost surely, 2^18391514834 is an apocalyptic number.

18391514834 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

18391514834 is a deficient number, since it is larger than the sum of its proper divisors (16009581742).

18391514834 is a wasteful number, since it uses less digits than its factorization.

18391514834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22850.

The product of its digits is 414720, while the sum is 47.

The spelling of 18391514834 in words is "eighteen billion, three hundred ninety-one million, five hundred fourteen thousand, eight hundred thirty-four".