63666558 has 12 divisors (see below), whose sum is σ = 137944248. Its totient is φ = 21222180.

The previous prime is 63666539. The next prime is 63666593. The reversal of 63666558 is 85566636.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1768498 + ... + 1768533.

It is an arithmetic number, because the mean of its divisors is an integer number (11495354).

Almost surely, 2^63666558 is an apocalyptic number.

63666558 is an abundant number, since it is smaller than the sum of its proper divisors (74277690).

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

63666558 is a wasteful number, since it uses less digits than its factorization.

63666558 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3537039 (or 3537036 counting only the distinct ones).

The product of its digits is 777600, while the sum is 45.

The square root of 63666558 is about 7979.1326596316. The cubic root of 63666558 is about 399.3041192436.

The spelling of 63666558 in words is "sixty-three million, six hundred sixty-six thousand, five hundred fifty-eight".