666630450 has 72 divisors (see below), whose sum is σ = 1799112900. Its totient is φ = 176964480.

The previous prime is 666630403. The next prime is 666630451. The reversal of 666630450 is 54036666.

It can be written as a sum of positive squares in 6 ways, for example, as 228523689 + 438106761 = 15117^2 + 20931^2 .

It is not an unprimeable number, because it can be changed into a prime (666630451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 99816 + ... + 106284.

Almost surely, 2^666630450 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666630450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (899556450).

666630450 is an abundant number, since it is smaller than the sum of its proper divisors (1132482450).

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

666630450 is a wasteful number, since it uses less digits than its factorization.

666630450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6716 (or 6708 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 36.

The square root of 666630450 is about 25819.1876324566. The cubic root of 666630450 is about 873.5646453636.

The spelling of 666630450 in words is "six hundred sixty-six million, six hundred thirty thousand, four hundred fifty".