12780963509 has 2 divisors, whose sum is σ = 12780963510. Its totient is φ = 12780963508.

The previous prime is 12780963479. The next prime is 12780963523. The reversal of 12780963509 is 90536908721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11772901009 + 1008062500 = 108503^2 + 31750^2 .

It is a cyclic number.

It is not a de Polignac number, because 12780963509 - 2²⁸ = 12512528053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12780963109) 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, 6390481754 + 6390481755.

It is an arithmetic number, because the mean of its divisors is an integer number (6390481755).

Almost surely, 2^12780963509 is an apocalyptic number.

It is an amenable number.

12780963509 is a deficient number, since it is larger than the sum of its proper divisors (1).

12780963509 is an equidigital number, since it uses as much as digits as its factorization.

12780963509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 816480, while the sum is 50.

The spelling of 12780963509 in words is "twelve billion, seven hundred eighty million, nine hundred sixty-three thousand, five hundred nine".