79721308685041 has 3 divisors (see below), whose sum is σ = 79721317613721. Its totient is φ = 79721299756362.

The previous prime is 79721308685023. The next prime is 79721308685069. The reversal of 79721308685041 is 14058680312797.

The square root of 79721308685041 is 8928679.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 79721308685041 - 2²³ = 79721300296433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79721308685741) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 4464340 + ... + 13393018.

It is an arithmetic number, because the mean of its divisors is an integer number (26573772537907).

It is a 2-persistent number, because it is pandigital, and so is 2⋅79721308685041 = 159442617370082, but 3⋅79721308685041 = 239163926055123 is not.

Almost surely, 2^{79721308685041} is an apocalyptic number.

79721308685041 is the 8928679-th square number.

79721308685041 is the 4464340-th centered octagonal number.

It is an amenable number.

79721308685041 is a deficient number, since it is larger than the sum of its proper divisors (8928680).

79721308685041 is an frugal number, since it uses more digits than its factorization.

79721308685041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17857358 (or 8928679 counting only the distinct ones).

The product of its (nonzero) digits is 20321280, while the sum is 61.

The spelling of 79721308685041 in words is "seventy-nine trillion, seven hundred twenty-one billion, three hundred eight million, six hundred eighty-five thousand, forty-one".