79721308684994 has 8 divisors (see below), whose sum is σ = 121542323077308. Its totient is φ = 39207200992560.

The previous prime is 79721308684981. The next prime is 79721308685023. The reversal of 79721308684994 is 49948680312797.

It can be written as a sum of positive squares in 2 ways, for example, as 79463942205025 + 257366479969 = 8914255^2 + 507313^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 326726674817 + ... + 326726675060.

Almost surely, 2^{79721308684994} is an apocalyptic number.

79721308684994 is a deficient number, since it is larger than the sum of its proper divisors (41821014392314).

79721308684994 is a wasteful number, since it uses less digits than its factorization.

79721308684994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 653453349940.

The product of its (nonzero) digits is 1316818944, while the sum is 77.

The spelling of 79721308684994 in words is "seventy-nine trillion, seven hundred twenty-one billion, three hundred eight million, six hundred eighty-four thousand, nine hundred ninety-four".