18538717000 has 64 divisors (see below), whose sum is σ = 43657277040. Its totient is φ = 7368192000.

The previous prime is 18538716983. The next prime is 18538717013. The reversal of 18538717000 is 71783581.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 71537764 + 18467179236 = 8458^2 + 135894^2 .

It is a Harshad number since it is a multiple of its sum of digits (40).

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, 97960 + ... + 216040.

Almost surely, 2^18538717000 is an apocalyptic number.

18538717000 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 18538717000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21828638520).

18538717000 is an abundant number, since it is smaller than the sum of its proper divisors (25118560040).

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

18538717000 is a wasteful number, since it uses less digits than its factorization.

18538717000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118259 (or 118245 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 40.

The spelling of 18538717000 in words is "eighteen billion, five hundred thirty-eight million, seven hundred seventeen thousand".