63215661 has 8 divisors (see below), whose sum is σ = 87952320. Its totient is φ = 40311392.

The previous prime is 63215651. The next prime is 63215681. The reversal of 63215661 is 16651236.

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

It is a cyclic number.

It is not a de Polignac number, because 63215661 - 2¹¹ = 63213613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63215651) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 458016 + ... + 458153.

It is an arithmetic number, because the mean of its divisors is an integer number (10994040).

Almost surely, 2^63215661 is an apocalyptic number.

It is an amenable number.

63215661 is a deficient number, since it is larger than the sum of its proper divisors (24736659).

63215661 is a wasteful number, since it uses less digits than its factorization.

63215661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 916195.

The product of its digits is 6480, while the sum is 30.

The square root of 63215661 is about 7950.8276927626. The cubic root of 63215661 is about 398.3592393804.

Adding to 63215661 its reverse (16651236), we get a palindrome (79866897).

The spelling of 63215661 in words is "sixty-three million, two hundred fifteen thousand, six hundred sixty-one".