780640344079 has 2 divisors, whose sum is σ = 780640344080. Its totient is φ = 780640344078.

The previous prime is 780640344067. The next prime is 780640344137. The reversal of 780640344079 is 970443046087.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 780640344079 - 2⁵ = 780640344047 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (780640344479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390320172039 + 390320172040.

It is an arithmetic number, because the mean of its divisors is an integer number (390320172040).

Almost surely, 2^780640344079 is an apocalyptic number.

780640344079 is a deficient number, since it is larger than the sum of its proper divisors (1).

780640344079 is an equidigital number, since it uses as much as digits as its factorization.

780640344079 is an odious number, because the sum of its binary digits is odd.

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

The spelling of 780640344079 in words is "seven hundred eighty billion, six hundred forty million, three hundred forty-four thousand, seventy-nine".