18357517399 has 16 divisors (see below), whose sum is σ = 20133463392. Its totient is φ = 16635282048.

The previous prime is 18357517379. The next prime is 18357517421. The reversal of 18357517399 is 99371575381.

It is a cyclic number.

It is not a de Polignac number, because 18357517399 - 2⁹ = 18357516887 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18357517309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 219237 + ... + 291169.

It is an arithmetic number, because the mean of its divisors is an integer number (1258341462).

Almost surely, 2^18357517399 is an apocalyptic number.

18357517399 is a deficient number, since it is larger than the sum of its proper divisors (1775945993).

18357517399 is a wasteful number, since it uses less digits than its factorization.

18357517399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72306.

The product of its digits is 7144200, while the sum is 58.

The spelling of 18357517399 in words is "eighteen billion, three hundred fifty-seven million, five hundred seventeen thousand, three hundred ninety-nine".