79054552721 has 4 divisors (see below), whose sum is σ = 81191162292. Its totient is φ = 76917943152.

The previous prime is 79054552663. The next prime is 79054552757. The reversal of 79054552721 is 12725545097.

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 53946565696 + 25107987025 = 232264^2 + 158455^2 .

It is a cyclic number.

It is not a de Polignac number, because 79054552721 - 2³⁴ = 61874683537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79054552771) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1068304730 + ... + 1068304803.

It is an arithmetic number, because the mean of its divisors is an integer number (20297790573).

Almost surely, 2^79054552721 is an apocalyptic number.

It is an amenable number.

79054552721 is a deficient number, since it is larger than the sum of its proper divisors (2136609571).

79054552721 is a wasteful number, since it uses less digits than its factorization.

79054552721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2136609570.

The product of its (nonzero) digits is 882000, while the sum is 47.

The spelling of 79054552721 in words is "seventy-nine billion, fifty-four million, five hundred fifty-two thousand, seven hundred twenty-one".