18438317135 has 16 divisors (see below), whose sum is σ = 25290510336. Its totient is φ = 12641579808.

The previous prime is 18438317123. The next prime is 18438317159. The reversal of 18438317135 is 53171383481.

It is a cyclic number.

It is not a de Polignac number, because 18438317135 - 2³⁴ = 1258447951 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 233042 + ... + 301968.

It is an arithmetic number, because the mean of its divisors is an integer number (1580656896).

Almost surely, 2^18438317135 is an apocalyptic number.

18438317135 is a deficient number, since it is larger than the sum of its proper divisors (6852193201).

18438317135 is an equidigital number, since it uses as much as digits as its factorization.

18438317135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76582.

The product of its digits is 241920, while the sum is 44.

The spelling of 18438317135 in words is "eighteen billion, four hundred thirty-eight million, three hundred seventeen thousand, one hundred thirty-five".