726500703253221 has 24 divisors (see below), whose sum is σ = 1165458064397760. Its totient is φ = 447077355845328.

The previous prime is 726500703253219. The next prime is 726500703253261. The reversal of 726500703253221 is 122352307005627.

It is a happy number.

726500703253221 is a `hidden beast` number, since 7 + 2 + 6 + 500 + 70 + 3 + 2 + 53 + 2 + 21 = 666.

726500703253221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 726500703253221 - 2¹ = 726500703253219 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (726500703253261) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 79607786721 + ... + 79607795846.

It is an arithmetic number, because the mean of its divisors is an integer number (48560752683240).

Almost surely, 2^{726500703253221} is an apocalyptic number.

It is an amenable number.

726500703253221 is a deficient number, since it is larger than the sum of its proper divisors (438957361144539).

726500703253221 is a wasteful number, since it uses less digits than its factorization.

726500703253221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159215582602 (or 159215582583 counting only the distinct ones).

The product of its (nonzero) digits is 1058400, while the sum is 45.

The spelling of 726500703253221 in words is "seven hundred twenty-six trillion, five hundred billion, seven hundred three million, two hundred fifty-three thousand, two hundred twenty-one".