18001515156 has 24 divisors (see below), whose sum is σ = 43829776704. Its totient is φ = 5739613440.

The previous prime is 18001515149. The next prime is 18001515197. The reversal of 18001515156 is 65151510081.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32611165 + ... + 32611716.

It is an arithmetic number, because the mean of its divisors is an integer number (1826240696).

Almost surely, 2^18001515156 is an apocalyptic number.

It is an amenable number.

18001515156 is an abundant number, since it is smaller than the sum of its proper divisors (25828261548).

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

18001515156 is a wasteful number, since it uses less digits than its factorization.

18001515156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65222911 (or 65222909 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 33.

The spelling of 18001515156 in words is "eighteen billion, one million, five hundred fifteen thousand, one hundred fifty-six".