66650 has 24 divisors (see below), whose sum is σ = 130944. Its totient is φ = 25200.

The previous prime is 66643. The next prime is 66653. The reversal of 66650 is 5666.

It is a happy number.

It is a Smith number, since the sum of its digits (23) coincides with the sum of the digits of its prime factors.

It is a plaindrome in base 13.

It is a nialpdrome in base 10.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 66650.

It is not an unprimeable number, because it can be changed into a prime (66653) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1529 + ... + 1571.

It is an arithmetic number, because the mean of its divisors is an integer number (5456).

2⁶⁶⁶⁵⁰ is an apocalyptic number.

66650 is a deficient number, since it is larger than the sum of its proper divisors (64294).

66650 is a wasteful number, since it uses less digits than its factorization.

66650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86 (or 81 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 66650 is about 258.1666128685. The cubic root of 66650 is about 40.5446340211.

The spelling of 66650 in words is "sixty-six thousand, six hundred fifty".