18676989365729 has 4 divisors (see below), whose sum is σ = 18677803662084. Its totient is φ = 18676175069376.

The previous prime is 18676989365717. The next prime is 18676989365773. The reversal of 18676989365729 is 92756398967681.

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 2428149295504 + 16248840070225 = 1558252^2 + 4030985^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18676989365729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18676989365129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 407113772 + ... + 407159645.

It is an arithmetic number, because the mean of its divisors is an integer number (4669450915521).

Almost surely, 2^{18676989365729} is an apocalyptic number.

It is an amenable number.

18676989365729 is a deficient number, since it is larger than the sum of its proper divisors (814296355).

18676989365729 is an equidigital number, since it uses as much as digits as its factorization.

18676989365729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 814296354.

The product of its digits is 14814213120, while the sum is 86.

The spelling of 18676989365729 in words is "eighteen trillion, six hundred seventy-six billion, nine hundred eighty-nine million, three hundred sixty-five thousand, seven hundred twenty-nine".