18194411136 has 128 divisors (see below), whose sum is σ = 52790189760. Its totient is φ = 5506375680.

The previous prime is 18194411113. The next prime is 18194411161. The reversal of 18194411136 is 63111449181.

It is a tau number, because it is divible by the number of its divisors (128).

It is a junction number, because it is equal to n+sod(n) for n = 18194411094 and 18194411103.

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, 3955590 + ... + 3960186.

Almost surely, 2^18194411136 is an apocalyptic number.

18194411136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18194411136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26395094880).

18194411136 is an abundant number, since it is smaller than the sum of its proper divisors (34595778624).

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

18194411136 is a wasteful number, since it uses less digits than its factorization.

18194411136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5562 (or 5550 counting only the distinct ones).

The product of its digits is 20736, while the sum is 39.

The spelling of 18194411136 in words is "eighteen billion, one hundred ninety-four million, four hundred eleven thousand, one hundred thirty-six".