66450917 has 8 divisors (see below), whose sum is σ = 72301656. Its totient is φ = 60705792.

The previous prime is 66450889. The next prime is 66450983. The reversal of 66450917 is 71905466.

It can be written as a sum of positive squares in 4 ways, for example, as 14984641 + 51466276 = 3871^2 + 7174^2 .

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 66450917 - 2²⁰ = 65402341 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66450017) 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 7 ways as a sum of consecutive naturals, for example, 25088 + ... + 27609.

It is an arithmetic number, because the mean of its divisors is an integer number (9037707).

Almost surely, 2^66450917 is an apocalyptic number.

It is an amenable number.

66450917 is a deficient number, since it is larger than the sum of its proper divisors (5850739).

66450917 is a wasteful number, since it uses less digits than its factorization.

66450917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52807.

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 66450917 is about 8151.7431878096. The cubic root of 66450917 is about 405.0422493139.

The spelling of 66450917 in words is "sixty-six million, four hundred fifty thousand, nine hundred seventeen".