716721617 has 2 divisors, whose sum is σ = 716721618. Its totient is φ = 716721616.

The previous prime is 716721611. The next prime is 716721619. The reversal of 716721617 is 716127617.

It is a happy number.

716721617 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 389509696 + 327211921 = 19736^2 + 18089^2 .

It is a cyclic number.

It is not a de Polignac number, because 716721617 - 2¹⁸ = 716459473 is a prime.

Together with 716721619, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (716721611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 358360808 + 358360809.

It is an arithmetic number, because the mean of its divisors is an integer number (358360809).

Almost surely, 2^716721617 is an apocalyptic number.

It is an amenable number.

716721617 is a deficient number, since it is larger than the sum of its proper divisors (1).

716721617 is an equidigital number, since it uses as much as digits as its factorization.

716721617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24696, while the sum is 38.

The square root of 716721617 is about 26771.6569715063. The cubic root of 716721617 is about 894.9185311235.

The spelling of 716721617 in words is "seven hundred sixteen million, seven hundred twenty-one thousand, six hundred seventeen".