18804520612817 has 2 divisors, whose sum is σ = 18804520612818. Its totient is φ = 18804520612816.

The previous prime is 18804520612739. The next prime is 18804520612873. The reversal of 18804520612817 is 71821602540881.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18781267717696 + 23252895121 = 4333736^2 + 152489^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18804520612817 is a prime.

It is not a weakly prime, because it can be changed into another prime (18804520612877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9402260306408 + 9402260306409.

It is an arithmetic number, because the mean of its divisors is an integer number (9402260306409).

Almost surely, 2^{18804520612817} is an apocalyptic number.

It is an amenable number.

18804520612817 is a deficient number, since it is larger than the sum of its proper divisors (1).

18804520612817 is an equidigital number, since it uses as much as digits as its factorization.

18804520612817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1720320, while the sum is 53.

The spelling of 18804520612817 in words is "eighteen trillion, eight hundred four billion, five hundred twenty million, six hundred twelve thousand, eight hundred seventeen".