18091918368 has 72 divisors (see below), whose sum is σ = 51491696256. Its totient is φ = 6025622400.

The previous prime is 18091918367. The next prime is 18091918373. The reversal of 18091918368 is 86381919081.

18091918368 is a `hidden beast` number, since 180 + 91 + 9 + 18 + 368 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is not an unprimeable number, because it can be changed into a prime (18091918363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 329013 + ... + 380043.

It is an arithmetic number, because the mean of its divisors is an integer number (715162448).

Almost surely, 2^18091918368 is an apocalyptic number.

18091918368 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

18091918368 is an abundant number, since it is smaller than the sum of its proper divisors (33399777888).

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

18091918368 is a wasteful number, since it uses less digits than its factorization.

18091918368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52278 (or 52267 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 54.

The spelling of 18091918368 in words is "eighteen billion, ninety-one million, nine hundred eighteen thousand, three hundred sixty-eight".