66610 has 8 divisors (see below), whose sum is σ = 119916. Its totient is φ = 26640.

The previous prime is 66601. The next prime is 66617. The reversal of 66610 is 1666.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 64009 + 2601 = 253^2 + 51^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (66617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3321 + ... + 3340.

2⁶⁶⁶¹⁰ is an apocalyptic number.

66610 is a deficient number, since it is larger than the sum of its proper divisors (53306).

66610 is a wasteful number, since it uses less digits than its factorization.

66610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6668.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 66610 is about 258.0891318905. The cubic root of 66610 is about 40.5365214434.

It can be divided in two parts, 666 and 10, that added together give a palindrome (676).

The spelling of 66610 in words is "sixty-six thousand, six hundred ten".