775506844249 has 2 divisors, whose sum is σ = 775506844250. Its totient is φ = 775506844248.

The previous prime is 775506844219. The next prime is 775506844253. The reversal of 775506844249 is 942448605577.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 749531720025 + 25975124224 = 865755^2 + 161168^2 .

It is a cyclic number.

It is not a de Polignac number, because 775506844249 - 2⁷ = 775506844121 is a prime.

It is not a weakly prime, because it can be changed into another prime (775506844219) 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, 387753422124 + 387753422125.

It is an arithmetic number, because the mean of its divisors is an integer number (387753422125).

Almost surely, 2^775506844249 is an apocalyptic number.

It is an amenable number.

775506844249 is a deficient number, since it is larger than the sum of its proper divisors (1).

775506844249 is an equidigital number, since it uses as much as digits as its factorization.

775506844249 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 67737600, while the sum is 61.

The spelling of 775506844249 in words is "seven hundred seventy-five billion, five hundred six million, eight hundred forty-four thousand, two hundred forty-nine".