720315722521 has 2 divisors, whose sum is σ = 720315722522. Its totient is φ = 720315722520.

The previous prime is 720315722507. The next prime is 720315722551. The reversal of 720315722521 is 125227513027.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 717849507600 + 2466214921 = 847260^2 + 49661^2 .

It is a cyclic number.

It is not a de Polignac number, because 720315722521 - 2⁷ = 720315722393 is a prime.

It is a super-2 number, since 2×720315722521² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (720315722501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360157861260 + 360157861261.

It is an arithmetic number, because the mean of its divisors is an integer number (360157861261).

Almost surely, 2^720315722521 is an apocalyptic number.

It is an amenable number.

720315722521 is a deficient number, since it is larger than the sum of its proper divisors (1).

720315722521 is an equidigital number, since it uses as much as digits as its factorization.

720315722521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 58800, while the sum is 37.

The spelling of 720315722521 in words is "seven hundred twenty billion, three hundred fifteen million, seven hundred twenty-two thousand, five hundred twenty-one".