63218561 has 8 divisors (see below), whose sum is σ = 72298560. Its totient is φ = 54150768.

The previous prime is 63218543. The next prime is 63218581. The reversal of 63218561 is 16581236.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 63218561 - 2¹⁰ = 63217537 is a prime.

It is a super-3 number, since 3×63218561³ (a number of 24 digits) contains 333 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (63218581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15995 + ... + 19551.

It is an arithmetic number, because the mean of its divisors is an integer number (9037320).

Almost surely, 2^63218561 is an apocalyptic number.

It is an amenable number.

63218561 is a deficient number, since it is larger than the sum of its proper divisors (9079999).

63218561 is a wasteful number, since it uses less digits than its factorization.

63218561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6103.

The product of its digits is 8640, while the sum is 32.

The square root of 63218561 is about 7951.0100616211. The cubic root of 63218561 is about 398.3653308252.

Adding to 63218561 its reverse (16581236), we get a palindrome (79799797).

The spelling of 63218561 in words is "sixty-three million, two hundred eighteen thousand, five hundred sixty-one".