721525072323697 has 2 divisors, whose sum is σ = 721525072323698. Its totient is φ = 721525072323696.

The previous prime is 721525072323631. The next prime is 721525072323721. The reversal of 721525072323697 is 796323270525127.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 708069960653056 + 13455111670641 = 26609584^2 + 3668121^2 .

It is a cyclic number.

It is not a de Polignac number, because 721525072323697 - 2¹¹ = 721525072321649 is a prime.

It is not a weakly prime, because it can be changed into another prime (721525072326697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360762536161848 + 360762536161849.

It is an arithmetic number, because the mean of its divisors is an integer number (360762536161849).

Almost surely, 2^{721525072323697} is an apocalyptic number.

It is an amenable number.

721525072323697 is a deficient number, since it is larger than the sum of its proper divisors (1).

721525072323697 is an equidigital number, since it uses as much as digits as its factorization.

721525072323697 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 66679200, while the sum is 61.

The spelling of 721525072323697 in words is "seven hundred twenty-one trillion, five hundred twenty-five billion, seventy-two million, three hundred twenty-three thousand, six hundred ninety-seven".