720685084121 has 4 divisors (see below), whose sum is σ = 720754198500. Its totient is φ = 720615969744.

The previous prime is 720685084117. The next prime is 720685084169. The reversal of 720685084121 is 121480586027.

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 393574296025 + 327110788096 = 627355^2 + 571936^2 .

It is a cyclic number.

It is not a de Polignac number, because 720685084121 - 2² = 720685084117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (720685084421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34541546 + ... + 34562403.

It is an arithmetic number, because the mean of its divisors is an integer number (180188549625).

Almost surely, 2^720685084121 is an apocalyptic number.

It is an amenable number.

720685084121 is a deficient number, since it is larger than the sum of its proper divisors (69114379).

720685084121 is a wasteful number, since it uses less digits than its factorization.

720685084121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69114378.

The product of its (nonzero) digits is 215040, while the sum is 44.

The spelling of 720685084121 in words is "seven hundred twenty billion, six hundred eighty-five million, eighty-four thousand, one hundred twenty-one".