666514944 has 120 divisors (see below), whose sum is σ = 1942717920. Its totient is φ = 219967488.

The previous prime is 666514897. The next prime is 666514951. The reversal of 666514944 is 449415666.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 666514944.

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 501609 + ... + 502935.

It is an arithmetic number, because the mean of its divisors is an integer number (16189316).

Almost surely, 2^666514944 is an apocalyptic number.

666514944 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666514944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (971358960).

666514944 is an abundant number, since it is smaller than the sum of its proper divisors (1276202976).

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

666514944 is a wasteful number, since it uses less digits than its factorization.

666514944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1460 (or 1441 counting only the distinct ones).

The product of its digits is 622080, while the sum is 45.

The square root of 666514944 is about 25816.9507107249. The cubic root of 666514944 is about 873.5141887294.

It can be divided in two parts, 6665 and 14944, that added together give a square (21609 = 147²).

The spelling of 666514944 in words is "six hundred sixty-six million, five hundred fourteen thousand, nine hundred forty-four".