79721308684093 has 2 divisors, whose sum is σ = 79721308684094. Its totient is φ = 79721308684092.

The previous prime is 79721308684063. The next prime is 79721308684103. The reversal of 79721308684093 is 39048680312797.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62539595607204 + 17181713076889 = 7908198^2 + 4145083^2 .

It is a cyclic number.

It is not a de Polignac number, because 79721308684093 - 2¹³ = 79721308675901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79721308684013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39860654342046 + 39860654342047.

It is an arithmetic number, because the mean of its divisors is an integer number (39860654342047).

Almost surely, 2^{79721308684093} is an apocalyptic number.

It is an amenable number.

79721308684093 is a deficient number, since it is larger than the sum of its proper divisors (1).

79721308684093 is an equidigital number, since it uses as much as digits as its factorization.

79721308684093 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 109734912, while the sum is 67.

The spelling of 79721308684093 in words is "seventy-nine trillion, seven hundred twenty-one billion, three hundred eight million, six hundred eighty-four thousand, ninety-three".