18350918500 has 24 divisors (see below), whose sum is σ = 40078407096. Its totient is φ = 7340367200.

The previous prime is 18350918473. The next prime is 18350918501. The reversal of 18350918500 is 581905381.

It can be written as a sum of positive squares in 4 ways, for example, as 149670756 + 18201247744 = 12234^2 + 134912^2 .

It is not an unprimeable number, because it can be changed into a prime (18350918501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18350419 + ... + 18351418.

It is an arithmetic number, because the mean of its divisors is an integer number (1669933629).

Almost surely, 2^18350918500 is an apocalyptic number.

18350918500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18350918500 is an abundant number, since it is smaller than the sum of its proper divisors (21727488596).

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

18350918500 is a wasteful number, since it uses less digits than its factorization.

18350918500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36701856 (or 36701844 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 40.

The spelling of 18350918500 in words is "eighteen billion, three hundred fifty million, nine hundred eighteen thousand, five hundred".