63551664 has 120 divisors (see below), whose sum is σ = 197947152. Its totient is φ = 18869760.

The previous prime is 63551651. The next prime is 63551699. The reversal of 63551664 is 46615536.

63551664 is a `hidden beast` number, since 635 + 5 + 16 + 6 + 4 = 666.

63551664 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

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 23 ways as a sum of consecutive naturals, for example, 83574 + ... + 84330.

Almost surely, 2^63551664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 63551664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98973576).

63551664 is an abundant number, since it is smaller than the sum of its proper divisors (134395488).

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

63551664 is a wasteful number, since it uses less digits than its factorization.

63551664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 835 (or 826 counting only the distinct ones).

The product of its digits is 64800, while the sum is 36.

The square root of 63551664 is about 7971.9297538300. The cubic root of 63551664 is about 399.0637770929.

The spelling of 63551664 in words is "sixty-three million, five hundred fifty-one thousand, six hundred sixty-four".