666495 has 16 divisors (see below), whose sum is σ = 1185120. Its totient is φ = 355392.

The previous prime is 666493. The next prime is 666511. The reversal of 666495 is 594666.

It is a happy number.

It is not a de Polignac number, because 666495 - 2¹ = 666493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2334 + ... + 2603.

It is an arithmetic number, because the mean of its divisors is an integer number (74070).

2⁶⁶⁶⁴⁹⁵ is an apocalyptic number.

666495 is a deficient number, since it is larger than the sum of its proper divisors (518625).

666495 is a wasteful number, since it uses less digits than its factorization.

666495 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4951 (or 4945 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

The square root of 666495 is about 816.3914502247. The cubic root of 666495 is about 87.3505475976.

It can be divided in two parts, 66 and 6495, that added together give a 8-th power (6561 = 3⁸).

The spelling of 666495 in words is "six hundred sixty-six thousand, four hundred ninety-five".