73131260728321 has 4 divisors (see below), whose sum is σ = 73132581295444. Its totient is φ = 73129940161200.

The previous prime is 73131260728319. The next prime is 73131260728333. The reversal of 73131260728321 is 12382706213137.

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 53100587610225 + 20030673118096 = 7287015^2 + 4475564^2 .

It is a cyclic number.

It is not a de Polignac number, because 73131260728321 - 2¹ = 73131260728319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (73131260728391) 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, 660200490 + ... + 660311251.

It is an arithmetic number, because the mean of its divisors is an integer number (18283145323861).

Almost surely, 2^{73131260728321} is an apocalyptic number.

It is an amenable number.

73131260728321 is a deficient number, since it is larger than the sum of its proper divisors (1320567123).

73131260728321 is a wasteful number, since it uses less digits than its factorization.

73131260728321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1320567122.

The product of its (nonzero) digits is 508032, while the sum is 46.

The spelling of 73131260728321 in words is "seventy-three trillion, one hundred thirty-one billion, two hundred sixty million, seven hundred twenty-eight thousand, three hundred twenty-one".