720912211993 has 2 divisors, whose sum is σ = 720912211994. Its totient is φ = 720912211992.

The previous prime is 720912211937. The next prime is 720912212021. The reversal of 720912211993 is 399112219027.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 713937122704 + 6975089289 = 844948^2 + 83517^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-720912211993 is a prime.

It is not a weakly prime, because it can be changed into another prime (720912211193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360456105996 + 360456105997.

It is an arithmetic number, because the mean of its divisors is an integer number (360456105997).

Almost surely, 2^720912211993 is an apocalyptic number.

It is an amenable number.

720912211993 is a deficient number, since it is larger than the sum of its proper divisors (1).

720912211993 is an equidigital number, since it uses as much as digits as its factorization.

720912211993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 122472, while the sum is 46.

The spelling of 720912211993 in words is "seven hundred twenty billion, nine hundred twelve million, two hundred eleven thousand, nine hundred ninety-three".