79721308685741 has 2 divisors, whose sum is σ = 79721308685742. Its totient is φ = 79721308685740.

The previous prime is 79721308685737. The next prime is 79721308685743. The reversal of 79721308685741 is 14758680312797.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64456073630116 + 15265235055625 = 8028454^2 + 3907075^2 .

It is an emirp because it is prime and its reverse (14758680312797) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79721308685741 - 2² = 79721308685737 is a prime.

Together with 79721308685743, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79721308685743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39860654342870 + 39860654342871.

It is an arithmetic number, because the mean of its divisors is an integer number (39860654342871).

It is a 1-persistent number, because it is pandigital, but 2⋅79721308685741 = 159442617371482 is not.

Almost surely, 2^{79721308685741} is an apocalyptic number.

It is an amenable number.

79721308685741 is a deficient number, since it is larger than the sum of its proper divisors (1).

79721308685741 is an equidigital number, since it uses as much as digits as its factorization.

79721308685741 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 142248960, while the sum is 68.

The spelling of 79721308685741 in words is "seventy-nine trillion, seven hundred twenty-one billion, three hundred eight million, six hundred eighty-five thousand, seven hundred forty-one".