79043689217 has 2 divisors, whose sum is σ = 79043689218. Its totient is φ = 79043689216.

The previous prime is 79043689189. The next prime is 79043689303. The reversal of 79043689217 is 71298634097.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60914682481 + 18129006736 = 246809^2 + 134644^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79043689217 is a prime.

It is not a weakly prime, because it can be changed into another prime (79043689117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39521844608 + 39521844609.

It is an arithmetic number, because the mean of its divisors is an integer number (39521844609).

Almost surely, 2^79043689217 is an apocalyptic number.

It is an amenable number.

79043689217 is a deficient number, since it is larger than the sum of its proper divisors (1).

79043689217 is an equidigital number, since it uses as much as digits as its factorization.

79043689217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4572288, while the sum is 56.

The spelling of 79043689217 in words is "seventy-nine billion, forty-three million, six hundred eighty-nine thousand, two hundred seventeen".