18931365067 has 16 divisors (see below), whose sum is σ = 20133568512. Its totient is φ = 17762389920.

The previous prime is 18931365059. The next prime is 18931365071. The reversal of 18931365067 is 76056313981.

It is not a de Polignac number, because 18931365067 - 2³ = 18931365059 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18931365067.

It is not an unprimeable number, because it can be changed into a prime (18931365017) 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, 496518 + ... + 533284.

It is an arithmetic number, because the mean of its divisors is an integer number (1258348032).

Almost surely, 2^18931365067 is an apocalyptic number.

18931365067 is a deficient number, since it is larger than the sum of its proper divisors (1202203445).

18931365067 is a wasteful number, since it uses less digits than its factorization.

18931365067 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37218.

The product of its (nonzero) digits is 816480, while the sum is 49.

The spelling of 18931365067 in words is "eighteen billion, nine hundred thirty-one million, three hundred sixty-five thousand, sixty-seven".