221660106563 has 16 divisors (see below), whose sum is σ = 253759994880. Its totient is φ = 189668952000.

The previous prime is 221660106541. The next prime is 221660106587. The reversal of 221660106563 is 365601066122.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 221660106563 - 2⁸ = 221660106307 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221660106523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18777263 + ... + 18789063.

It is an arithmetic number, because the mean of its divisors is an integer number (15859999680).

Almost surely, 2^221660106563 is an apocalyptic number.

221660106563 is a deficient number, since it is larger than the sum of its proper divisors (32099888317).

221660106563 is a wasteful number, since it uses less digits than its factorization.

221660106563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16178.

The product of its (nonzero) digits is 77760, while the sum is 38.

The spelling of 221660106563 in words is "two hundred twenty-one billion, six hundred sixty million, one hundred six thousand, five hundred sixty-three".