660222066 has 64 divisors (see below), whose sum is σ = 1591050240. Its totient is φ = 178649280.

The previous prime is 660222029. The next prime is 660222077.

660222066 is nontrivially palindromic in base 10.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 55800 + ... + 66588.

It is an arithmetic number, because the mean of its divisors is an integer number (24860160).

Almost surely, 2^660222066 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 660222066, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (795525120).

660222066 is an abundant number, since it is smaller than the sum of its proper divisors (930828174).

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

660222066 is a wasteful number, since it uses less digits than its factorization.

660222066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10879.

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 660222066 is about 25694.7867475097. The cubic root of 660222066 is about 870.7564065062.

The spelling of 660222066 in words is "six hundred sixty million, two hundred twenty-two thousand, sixty-six".