79396654721 has 4 divisors (see below), whose sum is σ = 81542510292. Its totient is φ = 77250799152.

The previous prime is 79396654669. The next prime is 79396654747. The reversal of 79396654721 is 12745669397.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 53217414721 + 26179240000 = 230689^2 + 161800^2 .

It is a cyclic number.

It is not a de Polignac number, because 79396654721 - 2¹⁸ = 79396392577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79396654921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1072927730 + ... + 1072927803.

It is an arithmetic number, because the mean of its divisors is an integer number (20385627573).

Almost surely, 2^79396654721 is an apocalyptic number.

It is an amenable number.

79396654721 is a deficient number, since it is larger than the sum of its proper divisors (2145855571).

79396654721 is a wasteful number, since it uses less digits than its factorization.

79396654721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2145855570.

The product of its digits is 17146080, while the sum is 59.

The spelling of 79396654721 in words is "seventy-nine billion, three hundred ninety-six million, six hundred fifty-four thousand, seven hundred twenty-one".