780400916717 has 2 divisors, whose sum is σ = 780400916718. Its totient is φ = 780400916716.

The previous prime is 780400916663. The next prime is 780400916719. The reversal of 780400916717 is 717619004087.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 741494932201 + 38905984516 = 861101^2 + 197246^2 .

It is an emirp because it is prime and its reverse (717619004087) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 780400916717 - 2⁶ = 780400916653 is a prime.

Together with 780400916719, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (780400916719) 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, 390200458358 + 390200458359.

It is an arithmetic number, because the mean of its divisors is an integer number (390200458359).

Almost surely, 2^780400916717 is an apocalyptic number.

It is an amenable number.

780400916717 is a deficient number, since it is larger than the sum of its proper divisors (1).

780400916717 is an equidigital number, since it uses as much as digits as its factorization.

780400916717 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 592704, while the sum is 50.

The spelling of 780400916717 in words is "seven hundred eighty billion, four hundred million, nine hundred sixteen thousand, seven hundred seventeen".