666252288 has 264 divisors, whose sum is σ = 2128028448. Its totient is φ = 199507968.

The previous prime is 666252283. The next prime is 666252289. The reversal of 666252288 is 882252666.

It is a super-2 number, since 2×666252288² = 887784222530469888, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666252281) 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, 8027095 + ... + 8027177.

Almost surely, 2^666252288 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666252288, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1064014224).

666252288 is an abundant number, since it is smaller than the sum of its proper divisors (1461776160).

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

666252288 is a wasteful number, since it uses less digits than its factorization.

666252288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189 (or 168 counting only the distinct ones).

The product of its digits is 552960, while the sum is 45.

The square root of 666252288 is about 25811.8633190245. The cubic root of 666252288 is about 873.3994306687.

The spelling of 666252288 in words is "six hundred sixty-six million, two hundred fifty-two thousand, two hundred eighty-eight".