79530057581 has 4 divisors (see below), whose sum is σ = 85647754332. Its totient is φ = 73412360832.

The previous prime is 79530057571. The next prime is 79530057619. The reversal of 79530057581 is 18575003597.

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 4968840100 + 74561217481 = 70490^2 + 273059^2 .

It is a cyclic number.

It is not a de Polignac number, because 79530057581 - 2¹⁴ = 79530041197 is a prime.

It is a super-2 number, since 2×79530057581² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79530057571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3058848356 + ... + 3058848381.

It is an arithmetic number, because the mean of its divisors is an integer number (21411938583).

Almost surely, 2^79530057581 is an apocalyptic number.

It is an amenable number.

79530057581 is a deficient number, since it is larger than the sum of its proper divisors (6117696751).

79530057581 is a wasteful number, since it uses less digits than its factorization.

79530057581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6117696750.

The product of its (nonzero) digits is 1323000, while the sum is 50.

The spelling of 79530057581 in words is "seventy-nine billion, five hundred thirty million, fifty-seven thousand, five hundred eighty-one".