66450617 has 4 divisors (see below), whose sum is σ = 66935796. Its totient is φ = 65965440.

The previous prime is 66450607. The next prime is 66450623. The reversal of 66450617 is 71605466.

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 57093136 + 9357481 = 7556^2 + 3059^2 .

It is a cyclic number.

It is not a de Polignac number, because 66450617 - 2²⁴ = 49673401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66450607) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 242384 + ... + 242657.

It is an arithmetic number, because the mean of its divisors is an integer number (16733949).

Almost surely, 2^66450617 is an apocalyptic number.

It is an amenable number.

66450617 is a deficient number, since it is larger than the sum of its proper divisors (485179).

66450617 is a wasteful number, since it uses less digits than its factorization.

66450617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 485178.

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 66450617 is about 8151.7247868166. The cubic root of 66450617 is about 405.0416397770.

The spelling of 66450617 in words is "sixty-six million, four hundred fifty thousand, six hundred seventeen".