79586940509 has 2 divisors, whose sum is σ = 79586940510. Its totient is φ = 79586940508.

The previous prime is 79586940497. The next prime is 79586940539. The reversal of 79586940509 is 90504968597.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46382083225 + 33204857284 = 215365^2 + 182222^2 .

It is a cyclic number.

It is not a de Polignac number, because 79586940509 - 2⁴ = 79586940493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79586940539) 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, 39793470254 + 39793470255.

It is an arithmetic number, because the mean of its divisors is an integer number (39793470255).

Almost surely, 2^79586940509 is an apocalyptic number.

It is an amenable number.

79586940509 is a deficient number, since it is larger than the sum of its proper divisors (1).

79586940509 is an equidigital number, since it uses as much as digits as its factorization.

79586940509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24494400, while the sum is 62.

The spelling of 79586940509 in words is "seventy-nine billion, five hundred eighty-six million, nine hundred forty thousand, five hundred nine".