720612000721 has 2 divisors, whose sum is σ = 720612000722. Its totient is φ = 720612000720.

The previous prime is 720612000697. The next prime is 720612000739. The reversal of 720612000721 is 127000216027.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 608563811025 + 112048189696 = 780105^2 + 334736^2 .

It is a cyclic number.

It is not a de Polignac number, because 720612000721 - 2⁷ = 720612000593 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 720612000721.

It is not a weakly prime, because it can be changed into another prime (720612000781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360306000360 + 360306000361.

It is an arithmetic number, because the mean of its divisors is an integer number (360306000361).

Almost surely, 2^720612000721 is an apocalyptic number.

It is an amenable number.

720612000721 is a deficient number, since it is larger than the sum of its proper divisors (1).

720612000721 is an equidigital number, since it uses as much as digits as its factorization.

720612000721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2352, while the sum is 28.

Adding to 720612000721 its reverse (127000216027), we get a palindrome (847612216748).

The spelling of 720612000721 in words is "seven hundred twenty billion, six hundred twelve million, seven hundred twenty-one", and thus it is an aban number.