8666505 has 36 divisors (see below), whose sum is σ = 15625740. Its totient is φ = 4443264.

The previous prime is 8666501. The next prime is 8666513. The reversal of 8666505 is 5056668.

It can be written as a sum of positive squares in 6 ways, for example, as 389376 + 8277129 = 624^2 + 2877^2 .

It is not a de Polignac number, because 8666505 - 2² = 8666501 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8666505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8666501) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 37731 + ... + 37959.

Almost surely, 2^8666505 is an apocalyptic number.

It is an amenable number.

8666505 is a deficient number, since it is larger than the sum of its proper divisors (6959235).

8666505 is a wasteful number, since it uses less digits than its factorization.

8666505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298 (or 266 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The square root of 8666505 is about 2943.8928309298. The cubic root of 8666505 is about 205.4067277006.

The spelling of 8666505 in words is "eight million, six hundred sixty-six thousand, five hundred five".