221063320665 has 192 divisors, whose sum is σ = 456820715520. Its totient is φ = 100570106880.

The previous prime is 221063320657. The next prime is 221063320759. The reversal of 221063320665 is 566023360122.

221063320665 is a `hidden beast` number, since 2 + 2 + 10 + 633 + 2 + 0 + 6 + 6 + 5 = 666.

221063320665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 221063320665 - 2³ = 221063320657 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 200419504 + ... + 200420606.

It is an arithmetic number, because the mean of its divisors is an integer number (2379274560).

Almost surely, 2^221063320665 is an apocalyptic number.

It is an amenable number.

221063320665 is an abundant number, since it is smaller than the sum of its proper divisors (235757394855).

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

221063320665 is a wasteful number, since it uses less digits than its factorization.

221063320665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1629 (or 1606 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 36.

Adding to 221063320665 its reverse (566023360122), we get a palindrome (787086680787).

The spelling of 221063320665 in words is "two hundred twenty-one billion, sixty-three million, three hundred twenty thousand, six hundred sixty-five".