631344666 has 32 divisors (see below), whose sum is σ = 1272660480. Its totient is φ = 208793664.

The previous prime is 631344647. The next prime is 631344671. The reversal of 631344666 is 666443136.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon 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 15 ways as a sum of consecutive naturals, for example, 519876 + ... + 521088.

It is an arithmetic number, because the mean of its divisors is an integer number (39770640).

Almost surely, 2^631344666 is an apocalyptic number.

631344666 is an abundant number, since it is smaller than the sum of its proper divisors (641315814).

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

631344666 is a wasteful number, since it uses less digits than its factorization.

631344666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1830.

The product of its digits is 186624, while the sum is 39.

The square root of 631344666 is about 25126.5729059894. The cubic root of 631344666 is about 857.8713653527.

The spelling of 631344666 in words is "six hundred thirty-one million, three hundred forty-four thousand, six hundred sixty-six".