721594579217 has 2 divisors, whose sum is σ = 721594579218. Its totient is φ = 721594579216.

The previous prime is 721594579171. The next prime is 721594579231. The reversal of 721594579217 is 712975495127.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 589185197056 + 132409382161 = 767584^2 + 363881^2 .

It is a cyclic number.

It is not a de Polignac number, because 721594579217 - 2¹⁶ = 721594513681 is a prime.

It is not a weakly prime, because it can be changed into another prime (721594579247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360797289608 + 360797289609.

It is an arithmetic number, because the mean of its divisors is an integer number (360797289609).

Almost surely, 2^721594579217 is an apocalyptic number.

It is an amenable number.

721594579217 is a deficient number, since it is larger than the sum of its proper divisors (1).

721594579217 is an equidigital number, since it uses as much as digits as its factorization.

721594579217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11113200, while the sum is 59.

The spelling of 721594579217 in words is "seven hundred twenty-one billion, five hundred ninety-four million, five hundred seventy-nine thousand, two hundred seventeen".