775224772649 has 2 divisors, whose sum is σ = 775224772650. Its totient is φ = 775224772648.

The previous prime is 775224772601. The next prime is 775224772657. The reversal of 775224772649 is 946277422577.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 571638820624 + 203585952025 = 756068^2 + 451205^2 .

It is an emirp because it is prime and its reverse (946277422577) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 775224772649 - 2⁸ = 775224772393 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 775224772591 and 775224772600.

It is not a weakly prime, because it can be changed into another prime (775224772249) 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, 387612386324 + 387612386325.

It is an arithmetic number, because the mean of its divisors is an integer number (387612386325).

Almost surely, 2^775224772649 is an apocalyptic number.

It is an amenable number.

775224772649 is a deficient number, since it is larger than the sum of its proper divisors (1).

775224772649 is an equidigital number, since it uses as much as digits as its factorization.

775224772649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 82978560, while the sum is 62.

The spelling of 775224772649 in words is "seven hundred seventy-five billion, two hundred twenty-four million, seven hundred seventy-two thousand, six hundred forty-nine".