660066660066 has 128 divisors (see below), whose sum is σ = 1485239162112. Its totient is φ = 193881600000.

The previous prime is 660066660061. The next prime is 660066660067.

660066660066 is nontrivially palindromic in base 10.

It is a Curzon number.

It is a zygodrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 660066659997 and 660066660024.

It is not an unprimeable number, because it can be changed into a prime (660066660061) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 66661716 + ... + 66671616.

It is an arithmetic number, because the mean of its divisors is an integer number (11603430954).

Almost surely, 2^660066660066 is an apocalyptic number.

660066660066 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 660066660066, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (742619581056).

660066660066 is an abundant number, since it is smaller than the sum of its proper divisors (825172502046).

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

660066660066 is a wasteful number, since it uses less digits than its factorization.

660066660066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10228.

The product of its (nonzero) digits is 1679616, while the sum is 48.

It can be divided in two parts, 6600 and 66660066, that added together give a palindrome (66666666).

The spelling of 660066660066 in words is "six hundred sixty billion, sixty-six million, six hundred sixty thousand, sixty-six".