666824544 has 36 divisors (see below), whose sum is σ = 1896283116. Its totient is φ = 222274752.

The previous prime is 666824527. The next prime is 666824563. The reversal of 666824544 is 445428666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a self number, because there is not a number n which added to its sum of digits gives 666824544.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 1157394 + ... + 1157969.

It is an arithmetic number, because the mean of its divisors is an integer number (52674531).

Almost surely, 2^666824544 is an apocalyptic number.

It is an amenable number.

666824544 is an abundant number, since it is smaller than the sum of its proper divisors (1229458572).

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

666824544 is a wasteful number, since it uses less digits than its factorization.

666824544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2315379 (or 2315368 counting only the distinct ones).

The product of its digits is 1105920, while the sum is 45.

The square root of 666824544 is about 25822.9460751480. The cubic root of 666824544 is about 873.6494185706.

The spelling of 666824544 in words is "six hundred sixty-six million, eight hundred twenty-four thousand, five hundred forty-four".