221673126166 has 4 divisors (see below), whose sum is σ = 332509689252. Its totient is φ = 110836563082.

The previous prime is 221673126131. The next prime is 221673126167. The reversal of 221673126166 is 661621376122.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221673126167) 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, 55418281540 + ... + 55418281543.

It is an arithmetic number, because the mean of its divisors is an integer number (83127422313).

Almost surely, 2^221673126166 is an apocalyptic number.

221673126166 is a deficient number, since it is larger than the sum of its proper divisors (110836563086).

221673126166 is a wasteful number, since it uses less digits than its factorization.

221673126166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110836563085.

The product of its digits is 217728, while the sum is 43.

The spelling of 221673126166 in words is "two hundred twenty-one billion, six hundred seventy-three million, one hundred twenty-six thousand, one hundred sixty-six".