18523890000 has 1200 divisors, whose sum is σ = 84494453120. Its totient is φ = 3849120000.

The previous prime is 18523889987. The next prime is 18523890037. The reversal of 18523890000 is 9832581.

It is a tau number, because it is divible by the number of its divisors (1200).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 239 ways as a sum of consecutive naturals, for example, 1683989995 + ... + 1683990005.

Almost surely, 2^18523890000 is an apocalyptic number.

18523890000 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 18523890000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42247226560).

18523890000 is an abundant number, since it is smaller than the sum of its proper divisors (65970563120).

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

18523890000 is an frugal number, since it uses more digits than its factorization.

18523890000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78 (or 28 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The spelling of 18523890000 in words is "eighteen billion, five hundred twenty-three million, eight hundred ninety thousand".