778940295449 has 2 divisors, whose sum is σ = 778940295450. Its totient is φ = 778940295448.

The previous prime is 778940295421. The next prime is 778940295457. The reversal of 778940295449 is 944592049877.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 753889319824 + 25050975625 = 868268^2 + 158275^2 .

It is a cyclic number.

It is not a de Polignac number, because 778940295449 - 2³² = 774645328153 is a prime.

It is a super-2 number, since 2×778940295449² (a number of 25 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (778940295479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 389470147724 + 389470147725.

It is an arithmetic number, because the mean of its divisors is an integer number (389470147725).

Almost surely, 2^778940295449 is an apocalyptic number.

It is an amenable number.

778940295449 is a deficient number, since it is larger than the sum of its proper divisors (1).

778940295449 is an equidigital number, since it uses as much as digits as its factorization.

778940295449 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 182891520, while the sum is 68.

The spelling of 778940295449 in words is "seven hundred seventy-eight billion, nine hundred forty million, two hundred ninety-five thousand, four hundred forty-nine".