221666570217116 has 6 divisors (see below), whose sum is σ = 387916497879960. Its totient is φ = 110833285108556.

The previous prime is 221666570217109. The next prime is 221666570217119. The reversal of 221666570217116 is 611712075666122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221666570217119) 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 as a sum of consecutive naturals, namely, 27708321277136 + ... + 27708321277143.

It is an arithmetic number, because the mean of its divisors is an integer number (64652749646660).

Almost surely, 2^{221666570217116} is an apocalyptic number.

It is an amenable number.

221666570217116 is a deficient number, since it is larger than the sum of its proper divisors (166249927662844).

221666570217116 is a wasteful number, since it uses less digits than its factorization.

221666570217116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55416642554283 (or 55416642554281 counting only the distinct ones).

The product of its (nonzero) digits is 2540160, while the sum is 53.

The spelling of 221666570217116 in words is "two hundred twenty-one trillion, six hundred sixty-six billion, five hundred seventy million, two hundred seventeen thousand, one hundred sixteen".