780400916663 has 2 divisors, whose sum is σ = 780400916664. Its totient is φ = 780400916662.

The previous prime is 780400916653. The next prime is 780400916717. The reversal of 780400916663 is 366619004087.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 780400916663 - 2¹⁸ = 780400654519 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (780400916623) 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, 390200458331 + 390200458332.

It is an arithmetic number, because the mean of its divisors is an integer number (390200458332).

Almost surely, 2^780400916663 is an apocalyptic number.

780400916663 is a deficient number, since it is larger than the sum of its proper divisors (1).

780400916663 is an equidigital number, since it uses as much as digits as its factorization.

780400916663 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1306368, while the sum is 50.

The spelling of 780400916663 in words is "seven hundred eighty billion, four hundred million, nine hundred sixteen thousand, six hundred sixty-three".