18800399718 has 24 divisors (see below), whose sum is σ = 42878105400. Its totient is φ = 5936968224.

The previous prime is 18800399713. The next prime is 18800399729. The reversal of 18800399718 is 81799300881.

18800399718 is a `hidden beast` number, since 188 + 0 + 0 + 399 + 71 + 8 = 666.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18800399711) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27485623 + ... + 27486306.

It is an arithmetic number, because the mean of its divisors is an integer number (1786587725).

Almost surely, 2^18800399718 is an apocalyptic number.

18800399718 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18800399718 is an abundant number, since it is smaller than the sum of its proper divisors (24077705682).

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

18800399718 is a wasteful number, since it uses less digits than its factorization.

18800399718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54971956 (or 54971953 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 54.

The spelling of 18800399718 in words is "eighteen billion, eight hundred million, three hundred ninety-nine thousand, seven hundred eighteen".