18591816819085 has 8 divisors (see below), whose sum is σ = 22310244560736. Its totient is φ = 14873410536720.

The previous prime is 18591816819073. The next prime is 18591816819127. The reversal of 18591816819085 is 58091861819581.

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

It is not a de Polignac number, because 18591816819085 - 2⁹ = 18591816818573 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3392899 + ... + 6978208.

It is an arithmetic number, because the mean of its divisors is an integer number (2788780570092).

Almost surely, 2^{18591816819085} is an apocalyptic number.

It is an amenable number.

18591816819085 is a deficient number, since it is larger than the sum of its proper divisors (3718427741651).

18591816819085 is a wasteful number, since it uses less digits than its factorization.

18591816819085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10729643.

The product of its (nonzero) digits is 49766400, while the sum is 70.

The spelling of 18591816819085 in words is "eighteen trillion, five hundred ninety-one billion, eight hundred sixteen million, eight hundred nineteen thousand, eighty-five".