812508705773 has 2 divisors, whose sum is σ = 812508705774. Its totient is φ = 812508705772.

The previous prime is 812508705721. The next prime is 812508705817. The reversal of 812508705773 is 377507805218.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 752379290404 + 60129415369 = 867398^2 + 245213^2 .

It is a cyclic number.

It is not a de Polignac number, because 812508705773 - 2²⁰ = 812507657197 is a prime.

It is a super-3 number, since 3×812508705773³ (a number of 37 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (812508705973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 406254352886 + 406254352887.

It is an arithmetic number, because the mean of its divisors is an integer number (406254352887).

Almost surely, 2^812508705773 is an apocalyptic number.

It is an amenable number.

812508705773 is a deficient number, since it is larger than the sum of its proper divisors (1).

812508705773 is an equidigital number, since it uses as much as digits as its factorization.

812508705773 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3292800, while the sum is 53.

The spelling of 812508705773 in words is "eight hundred twelve billion, five hundred eight million, seven hundred five thousand, seven hundred seventy-three".