18609904500 has 192 divisors, whose sum is σ = 61027319808. Its totient is φ = 4365840000.

The previous prime is 18609904499. The next prime is 18609904529. The reversal of 18609904500 is 540990681.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 493309 + ... + 529691.

It is an arithmetic number, because the mean of its divisors is an integer number (317850624).

Almost surely, 2^18609904500 is an apocalyptic number.

18609904500 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 18609904500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30513659904).

18609904500 is an abundant number, since it is smaller than the sum of its proper divisors (42417415308).

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

18609904500 is a wasteful number, since it uses less digits than its factorization.

18609904500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36447 (or 36435 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 42.

The spelling of 18609904500 in words is "eighteen billion, six hundred nine million, nine hundred four thousand, five hundred".