18013500812 has 12 divisors (see below), whose sum is σ = 32040407616. Its totient is φ = 8859098640.

The previous prime is 18013500811. The next prime is 18013500821. The reversal of 18013500812 is 21800531081.

It is not an unprimeable number, because it can be changed into a prime (18013500811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36912668 + ... + 36913155.

It is an arithmetic number, because the mean of its divisors is an integer number (2670033968).

Almost surely, 2^18013500812 is an apocalyptic number.

It is an amenable number.

18013500812 is a deficient number, since it is larger than the sum of its proper divisors (14026906804).

18013500812 is a wasteful number, since it uses less digits than its factorization.

18013500812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73825888 (or 73825886 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 29.

The spelling of 18013500812 in words is "eighteen billion, thirteen million, five hundred thousand, eight hundred twelve".