64666 has 16 divisors (see below), whose sum is σ = 115200. Its totient is φ = 26640.

The previous prime is 64663. The next prime is 64667. The reversal of 64666 is 66646.

64666 is a modest number, since divided by 666 gives 64 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 360 + ... + 508.

It is an arithmetic number, because the mean of its divisors is an integer number (7200).

2⁶⁴⁶⁶⁶ is an apocalyptic number.

64666 is a deficient number, since it is larger than the sum of its proper divisors (50534).

64666 is a wasteful number, since it uses less digits than its factorization.

64666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189.

The product of its digits is 5184, while the sum is 28.

The square root of 64666 is about 254.2951041605. The cubic root of 64666 is about 40.1382714742.

It can be divided in two parts, 64 and 666, that multiplied together give a palindrome (42624).

The spelling of 64666 in words is "sixty-four thousand, six hundred sixty-six".