828778770509 has 2 divisors, whose sum is σ = 828778770510. Its totient is φ = 828778770508.

The previous prime is 828778770461. The next prime is 828778770541. The reversal of 828778770509 is 905077877828.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 708958948009 + 119819822500 = 841997^2 + 346150^2 .

It is a cyclic number.

It is not a de Polignac number, because 828778770509 - 2²⁸ = 828510335053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (828778770569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 414389385254 + 414389385255.

It is an arithmetic number, because the mean of its divisors is an integer number (414389385255).

Almost surely, 2^828778770509 is an apocalyptic number.

It is an amenable number.

828778770509 is a deficient number, since it is larger than the sum of its proper divisors (1).

828778770509 is an equidigital number, since it uses as much as digits as its factorization.

828778770509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 110638080, while the sum is 68.

The spelling of 828778770509 in words is "eight hundred twenty-eight billion, seven hundred seventy-eight million, seven hundred seventy thousand, five hundred nine".