780872668909 has 2 divisors, whose sum is σ = 780872668910. Its totient is φ = 780872668908.

The previous prime is 780872668897. The next prime is 780872668943. The reversal of 780872668909 is 909866278087.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 780872668900 + 9 = 883670^2 + 3^2 .

It is a cyclic number.

It is not a de Polignac number, because 780872668909 - 2²⁵ = 780839114477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (780872668969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390436334454 + 390436334455.

It is an arithmetic number, because the mean of its divisors is an integer number (390436334455).

Almost surely, 2^780872668909 is an apocalyptic number.

It is an amenable number.

780872668909 is a deficient number, since it is larger than the sum of its proper divisors (1).

780872668909 is an equidigital number, since it uses as much as digits as its factorization.

780872668909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 146313216, while the sum is 70.

The spelling of 780872668909 in words is "seven hundred eighty billion, eight hundred seventy-two million, six hundred sixty-eight thousand, nine hundred nine".