716661409 has 2 divisors, whose sum is σ = 716661410. Its totient is φ = 716661408.

The previous prime is 716661403. The next prime is 716661431. The reversal of 716661409 is 904166617.

716661409 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 713157025 + 3504384 = 26705^2 + 1872^2 .

It is a cyclic number.

It is not a de Polignac number, because 716661409 - 2²⁹ = 179790497 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (716661403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 358330704 + 358330705.

It is an arithmetic number, because the mean of its divisors is an integer number (358330705).

Almost surely, 2^716661409 is an apocalyptic number.

It is an amenable number.

716661409 is a deficient number, since it is larger than the sum of its proper divisors (1).

716661409 is an equidigital number, since it uses as much as digits as its factorization.

716661409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 716661409 is about 26770.5324750928. The cubic root of 716661409 is about 894.8934712944.

The spelling of 716661409 in words is "seven hundred sixteen million, six hundred sixty-one thousand, four hundred nine".