18391359999 has 8 divisors (see below), whose sum is σ = 24522615472. Its totient is φ = 12260505600.

The previous prime is 18391359941. The next prime is 18391360007. The reversal of 18391359999 is 99995319381.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18391359999 - 2¹¹ = 18391357951 is a prime.

It is a super-2 number, since 2×18391359999² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18391359919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31449 + ... + 194349.

It is an arithmetic number, because the mean of its divisors is an integer number (3065326934).

Almost surely, 2^18391359999 is an apocalyptic number.

18391359999 is a deficient number, since it is larger than the sum of its proper divisors (6131255473).

18391359999 is a wasteful number, since it uses less digits than its factorization.

18391359999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200537.

The product of its digits is 21257640, while the sum is 66.

The spelling of 18391359999 in words is "eighteen billion, three hundred ninety-one million, three hundred fifty-nine thousand, nine hundred ninety-nine".