66650309 has 24 divisors (see below), whose sum is σ = 78714720. Its totient is φ = 56216160.

The previous prime is 66650291. The next prime is 66650321. The reversal of 66650309 is 90305666.

It is not a de Polignac number, because 66650309 - 2¹⁶ = 66584773 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66650329) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 121574 + ... + 122120.

It is an arithmetic number, because the mean of its divisors is an integer number (3279780).

Almost surely, 2^66650309 is an apocalyptic number.

It is an amenable number.

66650309 is a deficient number, since it is larger than the sum of its proper divisors (12064411).

66650309 is a wasteful number, since it uses less digits than its factorization.

66650309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 641 (or 630 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 35.

The square root of 66650309 is about 8163.9640494064. The cubic root of 66650309 is about 405.4469667812.

The spelling of 66650309 in words is "sixty-six million, six hundred fifty thousand, three hundred nine".