221430566206166 has 4 divisors (see below), whose sum is σ = 332145849309252. Its totient is φ = 110715283103082.

The previous prime is 221430566206133. The next prime is 221430566206189. The reversal of 221430566206166 is 661602665034122.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55357641551540 + ... + 55357641551543.

It is an arithmetic number, because the mean of its divisors is an integer number (83036462327313).

Almost surely, 2^{221430566206166} is an apocalyptic number.

221430566206166 is a deficient number, since it is larger than the sum of its proper divisors (110715283103086).

221430566206166 is a wasteful number, since it uses less digits than its factorization.

221430566206166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110715283103085.

The product of its (nonzero) digits is 3732480, while the sum is 50.

The spelling of 221430566206166 in words is "two hundred twenty-one trillion, four hundred thirty billion, five hundred sixty-six million, two hundred six thousand, one hundred sixty-six".