18011685444 has 48 divisors (see below), whose sum is σ = 42315577920. Its totient is φ = 5962844160.

The previous prime is 18011685437. The next prime is 18011685451. The reversal of 18011685444 is 44458611081.

It is an interprime number because it is at equal distance from previous prime (18011685437) and next prime (18011685451).

It is a junction number, because it is equal to n+sod(n) for n = 18011685396 and 18011685405.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1087852 + ... + 1104284.

It is an arithmetic number, because the mean of its divisors is an integer number (881574540).

Almost surely, 2^18011685444 is an apocalyptic number.

It is an amenable number.

18011685444 is an abundant number, since it is smaller than the sum of its proper divisors (24303892476).

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

18011685444 is a wasteful number, since it uses less digits than its factorization.

18011685444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17060 (or 17058 counting only the distinct ones).

The product of its (nonzero) digits is 122880, while the sum is 42.

The spelling of 18011685444 in words is "eighteen billion, eleven million, six hundred eighty-five thousand, four hundred forty-four".