66660 has 48 divisors (see below), whose sum is σ = 205632. Its totient is φ = 16000.

The previous prime is 66653. The next prime is 66683. The reversal of 66660 is 6666.

It is a plaindrome in base 13.

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 66660.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 610 + ... + 710.

It is an arithmetic number, because the mean of its divisors is an integer number (4284).

2⁶⁶⁶⁶⁰ is an apocalyptic number.

66660 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102816).

66660 is an abundant number, since it is smaller than the sum of its proper divisors (138972).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66660 is a wasteful number, since it uses less digits than its factorization.

66660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124 (or 122 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 66660 is about 258.1859794799. The cubic root of 66660 is about 40.5466616583.

It can be divided in two parts, 6 and 6660, that added together give a palindrome (6666).

The spelling of 66660 in words is "sixty-six thousand, six hundred sixty".