18353719000 has 64 divisors (see below), whose sum is σ = 43034940000. Its totient is φ = 7326576000.

The previous prime is 18353718941. The next prime is 18353719037. The reversal of 18353719000 is 91735381.

It is a happy number.

It is a super-2 number, since 2×18353719000² (a number of 21 digits) contains 22 as substring.

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, 480610 + ... + 517390.

Almost surely, 2^18353719000 is an apocalyptic number.

18353719000 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 18353719000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21517470000).

18353719000 is an abundant number, since it is smaller than the sum of its proper divisors (24681221000).

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

18353719000 is a wasteful number, since it uses less digits than its factorization.

18353719000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37301 (or 37287 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 37.

The spelling of 18353719000 in words is "eighteen billion, three hundred fifty-three million, seven hundred nineteen thousand".