18917189924959 has 16 divisors (see below), whose sum is σ = 19093596512256. Its totient is φ = 18741638376000.

The previous prime is 18917189924921. The next prime is 18917189924977. The reversal of 18917189924959 is 95942998171981.

It is a cyclic number.

It is not a de Polignac number, because 18917189924959 - 2¹⁵ = 18917189892191 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 (18917189924909) 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 15 ways as a sum of consecutive naturals, for example, 60767514 + ... + 61078024.

It is an arithmetic number, because the mean of its divisors is an integer number (1193349782016).

Almost surely, 2^{18917189924959} is an apocalyptic number.

18917189924959 is a deficient number, since it is larger than the sum of its proper divisors (176406587297).

18917189924959 is a wasteful number, since it uses less digits than its factorization.

18917189924959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311886.

The product of its digits is 1058158080, while the sum is 82.

The spelling of 18917189924959 in words is "eighteen trillion, nine hundred seventeen billion, one hundred eighty-nine million, nine hundred twenty-four thousand, nine hundred fifty-nine".