12784373809 has 2 divisors, whose sum is σ = 12784373810. Its totient is φ = 12784373808.

The previous prime is 12784373807. The next prime is 12784373827. The reversal of 12784373809 is 90837348721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12752733184 + 31640625 = 112928^2 + 5625^2 .

It is a cyclic number.

It is not a de Polignac number, because 12784373809 - 2¹ = 12784373807 is a prime.

Together with 12784373807, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (12784373807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6392186904 + 6392186905.

It is an arithmetic number, because the mean of its divisors is an integer number (6392186905).

Almost surely, 2^12784373809 is an apocalyptic number.

It is an amenable number.

12784373809 is a deficient number, since it is larger than the sum of its proper divisors (1).

12784373809 is an equidigital number, since it uses as much as digits as its factorization.

12784373809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2032128, while the sum is 52.

The spelling of 12784373809 in words is "twelve billion, seven hundred eighty-four million, three hundred seventy-three thousand, eight hundred nine".