66716305 has 8 divisors (see below), whose sum is σ = 80143272. Its totient is φ = 53317248.

The previous prime is 66716297. The next prime is 66716311. The reversal of 66716305 is 50361766.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 24088464 + 42627841 = 4908^2 + 6529^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66716305 - 2³ = 66716297 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1294 + ... + 11623.

It is an arithmetic number, because the mean of its divisors is an integer number (10017909).

Almost surely, 2^66716305 is an apocalyptic number.

It is an amenable number.

66716305 is a deficient number, since it is larger than the sum of its proper divisors (13426967).

66716305 is a wasteful number, since it uses less digits than its factorization.

66716305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13955.

The product of its (nonzero) digits is 22680, while the sum is 34.

The square root of 66716305 is about 8168.0049583726. The cubic root of 66716305 is about 405.5807448614.

The spelling of 66716305 in words is "sixty-six million, seven hundred sixteen thousand, three hundred five".