79295747991809 has 2 divisors, whose sum is σ = 79295747991810. Its totient is φ = 79295747991808.

The previous prime is 79295747991787. The next prime is 79295747991847. The reversal of 79295747991809 is 90819974759297.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73982017638400 + 5313730353409 = 8601280^2 + 2305153^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79295747991809 is a prime.

It is not a weakly prime, because it can be changed into another prime (79295747991869) 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, 39647873995904 + 39647873995905.

It is an arithmetic number, because the mean of its divisors is an integer number (39647873995905).

Almost surely, 2^{79295747991809} is an apocalyptic number.

It is an amenable number.

79295747991809 is a deficient number, since it is larger than the sum of its proper divisors (1).

79295747991809 is an equidigital number, since it uses as much as digits as its factorization.

79295747991809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6481218240, while the sum is 86.

The spelling of 79295747991809 in words is "seventy-nine trillion, two hundred ninety-five billion, seven hundred forty-seven million, nine hundred ninety-one thousand, eight hundred nine".