774400648309 has 2 divisors, whose sum is σ = 774400648310. Its totient is φ = 774400648308.

The previous prime is 774400648289. The next prime is 774400648327. The reversal of 774400648309 is 903846004477.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 534573011025 + 239827637284 = 731145^2 + 489722^2 .

It is a cyclic number.

It is not a de Polignac number, because 774400648309 - 2¹⁷ = 774400517237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (774400648339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 387200324154 + 387200324155.

It is an arithmetic number, because the mean of its divisors is an integer number (387200324155).

Almost surely, 2^774400648309 is an apocalyptic number.

It is an amenable number.

774400648309 is a deficient number, since it is larger than the sum of its proper divisors (1).

774400648309 is an equidigital number, since it uses as much as digits as its factorization.

774400648309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4064256, while the sum is 52.

The spelling of 774400648309 in words is "seven hundred seventy-four billion, four hundred million, six hundred forty-eight thousand, three hundred nine".