72565057717 has 4 divisors (see below), whose sum is σ = 72578380300. Its totient is φ = 72551735136.

The previous prime is 72565057699. The next prime is 72565057727. The reversal of 72565057717 is 71775056527.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71775056527 = 103 ⋅696845209.

It can be written as a sum of positive squares in 2 ways, for example, as 14862291921 + 57702765796 = 121911^2 + 240214^2 .

It is a cyclic number.

It is not a de Polignac number, because 72565057717 - 2¹⁵ = 72565024949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72565057727) 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, 6653118 + ... + 6664015.

It is an arithmetic number, because the mean of its divisors is an integer number (18144595075).

Almost surely, 2^72565057717 is an apocalyptic number.

It is an amenable number.

72565057717 is a deficient number, since it is larger than the sum of its proper divisors (13322583).

72565057717 is a wasteful number, since it uses less digits than its factorization.

72565057717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13322582.

The product of its (nonzero) digits is 3601500, while the sum is 52.

The spelling of 72565057717 in words is "seventy-two billion, five hundred sixty-five million, fifty-seven thousand, seven hundred seventeen".