666432416 has 48 divisors (see below), whose sum is σ = 1425569544. Its totient is φ = 304840704.

The previous prime is 666432379. The next prime is 666432433. The reversal of 666432416 is 614234666.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 481363600 + 185068816 = 21940^2 + 13604^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 666432416.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39920 + ... + 54096.

Almost surely, 2^666432416 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 666432416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (712784772).

666432416 is an abundant number, since it is smaller than the sum of its proper divisors (759137128).

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

666432416 is a wasteful number, since it uses less digits than its factorization.

666432416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14313 (or 14305 counting only the distinct ones).

The product of its digits is 124416, while the sum is 38.

The square root of 666432416 is about 25815.3523315100. The cubic root of 666432416 is about 873.4781343468.

The spelling of 666432416 in words is "six hundred sixty-six million, four hundred thirty-two thousand, four hundred sixteen".