79641042217361 has 2 divisors, whose sum is σ = 79641042217362. Its totient is φ = 79641042217360.

The previous prime is 79641042217337. The next prime is 79641042217391. The reversal of 79641042217361 is 16371224014697.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73589289696400 + 6051752520961 = 8578420^2 + 2460031^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79641042217361 is a prime.

It is not a weakly prime, because it can be changed into another prime (79641042217391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39820521108680 + 39820521108681.

It is an arithmetic number, because the mean of its divisors is an integer number (39820521108681).

Almost surely, 2^{79641042217361} is an apocalyptic number.

It is an amenable number.

79641042217361 is a deficient number, since it is larger than the sum of its proper divisors (1).

79641042217361 is an equidigital number, since it uses as much as digits as its factorization.

79641042217361 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3048192, while the sum is 53.

The spelling of 79641042217361 in words is "seventy-nine trillion, six hundred forty-one billion, forty-two million, two hundred seventeen thousand, three hundred sixty-one".