666502440 has 32 divisors (see below), whose sum is σ = 1999507680. Its totient is φ = 177733952.

The previous prime is 666502433. The next prime is 666502453. The reversal of 666502440 is 44205666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2776974 + ... + 2777213.

It is an arithmetic number, because the mean of its divisors is an integer number (62484615).

Almost surely, 2^666502440 is an apocalyptic number.

666502440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

666502440 is an abundant number, since it is smaller than the sum of its proper divisors (1333005240).

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

666502440 is a wasteful number, since it uses less digits than its factorization.

666502440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5554201 (or 5554197 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 33.

The square root of 666502440 is about 25816.7085431122. The cubic root of 666502440 is about 873.5087262414.

The spelling of 666502440 in words is "six hundred sixty-six million, five hundred two thousand, four hundred forty".