666441200 has 60 divisors (see below), whose sum is σ = 1635237600. Its totient is φ = 260897280.

The previous prime is 666441187. The next prime is 666441221. The reversal of 666441200 is 2144666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1076 + ... + 36524.

It is an arithmetic number, because the mean of its divisors is an integer number (27253960).

Almost surely, 2^666441200 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 666441200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (817618800).

666441200 is an abundant number, since it is smaller than the sum of its proper divisors (968796400).

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

666441200 is a wasteful number, since it uses less digits than its factorization.

666441200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35514 (or 35503 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 666441200 is about 25815.5224622706. The cubic root of 666441200 is about 873.4819719943.

Adding to 666441200 its reverse (2144666), we get a palindrome (668585866).

The spelling of 666441200 in words is "six hundred sixty-six million, four hundred forty-one thousand, two hundred".