18576638636693 has 2 divisors, whose sum is σ = 18576638636694. Its totient is φ = 18576638636692.

The previous prime is 18576638636681. The next prime is 18576638636707. The reversal of 18576638636693 is 39663683667581.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11313791505604 + 7262847131089 = 3363598^2 + 2694967^2 .

It is a cyclic number.

It is not a de Polignac number, because 18576638636693 - 2¹² = 18576638632597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18576638636653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9288319318346 + 9288319318347.

It is an arithmetic number, because the mean of its divisors is an integer number (9288319318347).

Almost surely, 2^{18576638636693} is an apocalyptic number.

It is an amenable number.

18576638636693 is a deficient number, since it is larger than the sum of its proper divisors (1).

18576638636693 is an equidigital number, since it uses as much as digits as its factorization.

18576638636693 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4232632320, while the sum is 77.

The spelling of 18576638636693 in words is "eighteen trillion, five hundred seventy-six billion, six hundred thirty-eight million, six hundred thirty-six thousand, six hundred ninety-three".