18726847673 has 2 divisors, whose sum is σ = 18726847674. Its totient is φ = 18726847672.

The previous prime is 18726847651. The next prime is 18726847723. The reversal of 18726847673 is 37674862781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14043909049 + 4682938624 = 118507^2 + 68432^2 .

It is an emirp because it is prime and its reverse (37674862781) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18726847673 is a prime.

It is not a weakly prime, because it can be changed into another prime (18726847613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9363423836 + 9363423837.

It is an arithmetic number, because the mean of its divisors is an integer number (9363423837).

Almost surely, 2^18726847673 is an apocalyptic number.

It is an amenable number.

18726847673 is a deficient number, since it is larger than the sum of its proper divisors (1).

18726847673 is an equidigital number, since it uses as much as digits as its factorization.

18726847673 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18966528, while the sum is 59.

The spelling of 18726847673 in words is "eighteen billion, seven hundred twenty-six million, eight hundred forty-seven thousand, six hundred seventy-three".