221771676322166 has 4 divisors (see below), whose sum is σ = 332657514483252. Its totient is φ = 110885838161082.

The previous prime is 221771676322117. The next prime is 221771676322187. The reversal of 221771676322166 is 661223676177122.

It is a happy number.

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, 55442919080540 + ... + 55442919080543.

It is an arithmetic number, because the mean of its divisors is an integer number (83164378620813).

Almost surely, 2^{221771676322166} is an apocalyptic number.

221771676322166 is a deficient number, since it is larger than the sum of its proper divisors (110885838161086).

221771676322166 is a wasteful number, since it uses less digits than its factorization.

221771676322166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110885838161085.

The product of its digits is 21337344, while the sum is 59.

The spelling of 221771676322166 in words is "two hundred twenty-one trillion, seven hundred seventy-one billion, six hundred seventy-six million, three hundred twenty-two thousand, one hundred sixty-six".