79865172349 has 2 divisors, whose sum is σ = 79865172350. Its totient is φ = 79865172348.

The previous prime is 79865172329. The next prime is 79865172367. The reversal of 79865172349 is 94327156897.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79383062500 + 482109849 = 281750^2 + 21957^2 .

It is an emirp because it is prime and its reverse (94327156897) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79865172349 - 2⁷ = 79865172221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79865172329) 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, 39932586174 + 39932586175.

It is an arithmetic number, because the mean of its divisors is an integer number (39932586175).

Almost surely, 2^79865172349 is an apocalyptic number.

It is an amenable number.

79865172349 is a deficient number, since it is larger than the sum of its proper divisors (1).

79865172349 is an equidigital number, since it uses as much as digits as its factorization.

79865172349 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22861440, while the sum is 61.

The spelling of 79865172349 in words is "seventy-nine billion, eight hundred sixty-five million, one hundred seventy-two thousand, three hundred forty-nine".