631971664 has 20 divisors (see below), whose sum is σ = 1227924756. Its totient is φ = 315087872.

The previous prime is 631971661. The next prime is 631971677. The reversal of 631971664 is 466179136.

631971664 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 306530064 + 325441600 = 17508^2 + 18040^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 631971664.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631971661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50299 + ... + 61594.

Almost surely, 2^631971664 is an apocalyptic number.

It is an amenable number.

631971664 is a deficient number, since it is larger than the sum of its proper divisors (595953092).

631971664 is a wasteful number, since it uses less digits than its factorization.

631971664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112254 (or 112248 counting only the distinct ones).

The product of its digits is 163296, while the sum is 43.

The square root of 631971664 is about 25139.0466008558. The cubic root of 631971664 is about 858.1552597648.

The spelling of 631971664 in words is "six hundred thirty-one million, nine hundred seventy-one thousand, six hundred sixty-four".