18091779534085 has 4 divisors (see below), whose sum is σ = 21710135440908. Its totient is φ = 14473423627264.

The previous prime is 18091779534083. The next prime is 18091779534121. The reversal of 18091779534085 is 58043597719081.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9739598613889 + 8352180920196 = 3120833^2 + 2890014^2 .

It is a cyclic number.

It is not a de Polignac number, because 18091779534085 - 2¹ = 18091779534083 is a prime.

It is a Smith number, since the sum of its digits (67) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18091779534085.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18091779534083) 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 3 ways as a sum of consecutive naturals, for example, 1809177953404 + ... + 1809177953413.

It is an arithmetic number, because the mean of its divisors is an integer number (5427533860227).

Almost surely, 2^{18091779534085} is an apocalyptic number.

It is an amenable number.

18091779534085 is a deficient number, since it is larger than the sum of its proper divisors (3618355906823).

18091779534085 is an equidigital number, since it uses as much as digits as its factorization.

18091779534085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3618355906822.

The product of its (nonzero) digits is 76204800, while the sum is 67.

The spelling of 18091779534085 in words is "eighteen trillion, ninety-one billion, seven hundred seventy-nine million, five hundred thirty-four thousand, eighty-five".