716660621 has 4 divisors (see below), whose sum is σ = 717920700. Its totient is φ = 715400544.

The previous prime is 716660599. The next prime is 716660671. The reversal of 716660621 is 126066617.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 489073225 + 227587396 = 22115^2 + 15086^2 .

It is a cyclic number.

It is not a de Polignac number, because 716660621 - 2¹⁰ = 716659597 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (716660671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 629186 + ... + 630323.

It is an arithmetic number, because the mean of its divisors is an integer number (179480175).

Almost surely, 2^716660621 is an apocalyptic number.

It is an amenable number.

716660621 is a deficient number, since it is larger than the sum of its proper divisors (1260079).

716660621 is a wasteful number, since it uses less digits than its factorization.

716660621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1260078.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 716660621 is about 26770.5177574137. The cubic root of 716660621 is about 894.8931433030.

The spelling of 716660621 in words is "seven hundred sixteen million, six hundred sixty thousand, six hundred twenty-one".