79883857409 has 2 divisors, whose sum is σ = 79883857410. Its totient is φ = 79883857408.

The previous prime is 79883857387. The next prime is 79883857513. The reversal of 79883857409 is 90475838897.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79366158400 + 517699009 = 281720^2 + 22753^2 .

It is a cyclic number.

It is not a de Polignac number, because 79883857409 - 2²⁰ = 79882808833 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (79883854409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39941928704 + 39941928705.

It is an arithmetic number, because the mean of its divisors is an integer number (39941928705).

Almost surely, 2^79883857409 is an apocalyptic number.

It is an amenable number.

79883857409 is a deficient number, since it is larger than the sum of its proper divisors (1).

79883857409 is an equidigital number, since it uses as much as digits as its factorization.

79883857409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 121927680, while the sum is 68.

The spelling of 79883857409 in words is "seventy-nine billion, eight hundred eighty-three million, eight hundred fifty-seven thousand, four hundred nine".