18664800191 has 24 divisors (see below), whose sum is σ = 20283840720. Its totient is φ = 17114042880.

The previous prime is 18664800181. The next prime is 18664800211. The reversal of 18664800191 is 19100846681.

It is not a de Polignac number, because 18664800191 - 2¹⁸ = 18664538047 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 (18664800181) 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 23 ways as a sum of consecutive naturals, for example, 6893660 + ... + 6896366.

It is an arithmetic number, because the mean of its divisors is an integer number (845160030).

Almost surely, 2^18664800191 is an apocalyptic number.

18664800191 is a deficient number, since it is larger than the sum of its proper divisors (1619040529).

18664800191 is a wasteful number, since it uses less digits than its factorization.

18664800191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2955 (or 2894 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 44.

The spelling of 18664800191 in words is "eighteen billion, six hundred sixty-four million, eight hundred thousand, one hundred ninety-one".