63655563 has 4 divisors (see below), whose sum is σ = 84874088. Its totient is φ = 42437040.

The previous prime is 63655549. The next prime is 63655589. The reversal of 63655563 is 36555636.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 63655563 - 2¹⁴ = 63639179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63655063) 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, 10609258 + ... + 10609263.

It is an arithmetic number, because the mean of its divisors is an integer number (21218522).

Almost surely, 2^63655563 is an apocalyptic number.

63655563 is a deficient number, since it is larger than the sum of its proper divisors (21218525).

63655563 is a wasteful number, since it uses less digits than its factorization.

63655563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21218524.

The product of its digits is 243000, while the sum is 39.

The square root of 63655563 is about 7978.4436452230. The cubic root of 63655563 is about 399.2811317617.

The spelling of 63655563 in words is "sixty-three million, six hundred fifty-five thousand, five hundred sixty-three".