63651664 has 10 divisors (see below), whose sum is σ = 123325130. Its totient is φ = 31825824.

The previous prime is 63651661. The next prime is 63651673. The reversal of 63651664 is 46615636.

It can be written as a sum of positive squares in only one way, i.e., 51955264 + 11696400 = 7208^2 + 3420^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63651661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1989099 + ... + 1989130.

It is an arithmetic number, because the mean of its divisors is an integer number (12332513).

Almost surely, 2^63651664 is an apocalyptic number.

It is an amenable number.

63651664 is a deficient number, since it is larger than the sum of its proper divisors (59673466).

63651664 is a wasteful number, since it uses less digits than its factorization.

63651664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3978237 (or 3978231 counting only the distinct ones).

The product of its digits is 77760, while the sum is 37.

The square root of 63651664 is about 7978.1992955804. The cubic root of 63651664 is about 399.2729794032.

The spelling of 63651664 in words is "sixty-three million, six hundred fifty-one thousand, six hundred sixty-four".