18328677801985 has 4 divisors (see below), whose sum is σ = 21994413362388. Its totient is φ = 14662942241584.

The previous prime is 18328677801979. The next prime is 18328677801989. The reversal of 18328677801985 is 58910877682381.

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 13213101410289 + 5115576391696 = 3634983^2 + 2261764^2 .

It is a cyclic number.

It is not a de Polignac number, because 18328677801985 - 2¹⁵ = 18328677769217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18328677801989) 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 3 ways as a sum of consecutive naturals, for example, 1832867780194 + ... + 1832867780203.

It is an arithmetic number, because the mean of its divisors is an integer number (5498603340597).

Almost surely, 2^{18328677801985} is an apocalyptic number.

It is an amenable number.

18328677801985 is a deficient number, since it is larger than the sum of its proper divisors (3665735560403).

18328677801985 is an equidigital number, since it uses as much as digits as its factorization.

18328677801985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3665735560402.

The product of its (nonzero) digits is 325140480, while the sum is 73.

The spelling of 18328677801985 in words is "eighteen trillion, three hundred twenty-eight billion, six hundred seventy-seven million, eight hundred one thousand, nine hundred eighty-five".