221655321634664 has 32 divisors (see below), whose sum is σ = 421409610336000. Its totient is φ = 109280237657472.

The previous prime is 221655321634601. The next prime is 221655321634679. The reversal of 221655321634664 is 466436123556122.

It is a hoax number, since the sum of its digits (56) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 48571544 + ... + 52938695.

It is an arithmetic number, because the mean of its divisors is an integer number (13169050323000).

Almost surely, 2^{221655321634664} is an apocalyptic number.

It is an amenable number.

221655321634664 is a deficient number, since it is larger than the sum of its proper divisors (199754288701336).

221655321634664 is a wasteful number, since it uses less digits than its factorization.

221655321634664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101514057 (or 101514053 counting only the distinct ones).

The product of its digits is 37324800, while the sum is 56.

The spelling of 221655321634664 in words is "two hundred twenty-one trillion, six hundred fifty-five billion, three hundred twenty-one million, six hundred thirty-four thousand, six hundred sixty-four".