66220168 has 96 divisors (see below), whose sum is σ = 161287200. Its totient is φ = 25256448.

The previous prime is 66220157. The next prime is 66220169. The reversal of 66220168 is 86102266.

It is a super-2 number, since 2×66220168² = 8770221299896448, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66220169) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 126355 + ... + 126877.

It is an arithmetic number, because the mean of its divisors is an integer number (1680075).

Almost surely, 2^66220168 is an apocalyptic number.

66220168 is a gapful number since it is divisible by the number (68) 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 66220168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80643600).

66220168 is an abundant number, since it is smaller than the sum of its proper divisors (95067032).

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

66220168 is a wasteful number, since it uses less digits than its factorization.

66220168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 579 (or 568 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 66220168 is about 8137.5775265124. The cubic root of 66220168 is about 404.5728728675.

The spelling of 66220168 in words is "sixty-six million, two hundred twenty thousand, one hundred sixty-eight".