221893662656 has 28 divisors (see below), whose sum is σ = 463494988680. Its totient is φ = 105107523840.

The previous prime is 221893662649. The next prime is 221893662659. The reversal of 221893662656 is 656266398122.

221893662656 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221893662659) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 91237955 + ... + 91240386.

Almost surely, 2^221893662656 is an apocalyptic number.

It is an amenable number.

221893662656 is an abundant number, since it is smaller than the sum of its proper divisors (241601326024).

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

221893662656 is a wasteful number, since it uses less digits than its factorization.

221893662656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182478372 (or 182478362 counting only the distinct ones).

The product of its digits is 11197440, while the sum is 56.

The spelling of 221893662656 in words is "two hundred twenty-one billion, eight hundred ninety-three million, six hundred sixty-two thousand, six hundred fifty-six".