18189694560 has 96 divisors (see below), whose sum is σ = 57471144192. Its totient is φ = 4835888640.

The previous prime is 18189694559. The next prime is 18189694577. The reversal of 18189694560 is 6549698181.

It is a tau number, because it is divible by the number of its divisors (96).

It is a self number, because there is not a number n which added to its sum of digits gives 18189694560.

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, 101637 + ... + 216123.

It is an arithmetic number, because the mean of its divisors is an integer number (598657752).

Almost surely, 2^18189694560 is an apocalyptic number.

18189694560 is a gapful number since it is divisible by the number (10) 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 18189694560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28735572096).

18189694560 is an abundant number, since it is smaller than the sum of its proper divisors (39281449632).

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

18189694560 is a wasteful number, since it uses less digits than its factorization.

18189694560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114836 (or 114828 counting only the distinct ones).

The product of its (nonzero) digits is 3732480, while the sum is 57.

The spelling of 18189694560 in words is "eighteen billion, one hundred eighty-nine million, six hundred ninety-four thousand, five hundred sixty".