72365041321 has 4 divisors (see below), whose sum is σ = 72665311444. Its totient is φ = 72064771200.

The previous prime is 72365041319. The next prime is 72365041327. The reversal of 72365041321 is 12314056327.

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 58631779600 + 13733261721 = 242140^2 + 117189^2 .

It is a cyclic number.

It is not a de Polignac number, because 72365041321 - 2¹ = 72365041319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72365041327) 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, 150134700 + ... + 150135181.

It is an arithmetic number, because the mean of its divisors is an integer number (18166327861).

Almost surely, 2^72365041321 is an apocalyptic number.

It is an amenable number.

72365041321 is a deficient number, since it is larger than the sum of its proper divisors (300270123).

72365041321 is a wasteful number, since it uses less digits than its factorization.

72365041321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300270122.

The product of its (nonzero) digits is 30240, while the sum is 34.

Adding to 72365041321 its reverse (12314056327), we get a palindrome (84679097648).

The spelling of 72365041321 in words is "seventy-two billion, three hundred sixty-five million, forty-one thousand, three hundred twenty-one".