63665560 has 32 divisors (see below), whose sum is σ = 163712160. Its totient is φ = 21828096.

The previous prime is 63665551. The next prime is 63665573. The reversal of 63665560 is 6556636.

It is a happy number.

It is a super-2 number, since 2×63665560² = 8106607060227200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 113409 + ... + 113968.

It is an arithmetic number, because the mean of its divisors is an integer number (5116005).

Almost surely, 2^63665560 is an apocalyptic number.

It is an amenable number.

63665560 is an abundant number, since it is smaller than the sum of its proper divisors (100046600).

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

63665560 is a wasteful number, since it uses less digits than its factorization.

63665560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227395 (or 227391 counting only the distinct ones).

The product of its (nonzero) digits is 97200, while the sum is 37.

The square root of 63665560 is about 7979.0701212610. The cubic root of 63665560 is about 399.3020328129.

The spelling of 63665560 in words is "sixty-three million, six hundred sixty-five thousand, five hundred sixty".