221965166 has 8 divisors (see below), whose sum is σ = 339229944. Its totient is φ = 108888520.

The previous prime is 221965123. The next prime is 221965169. The reversal of 221965166 is 661569122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221965169) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1046900 + ... + 1047111.

It is an arithmetic number, because the mean of its divisors is an integer number (42403743).

Almost surely, 2^221965166 is an apocalyptic number.

221965166 is a deficient number, since it is larger than the sum of its proper divisors (117264778).

221965166 is a wasteful number, since it uses less digits than its factorization.

221965166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2094066.

The product of its digits is 38880, while the sum is 38.

The square root of 221965166 is about 14898.4954273913. The cubic root of 221965166 is about 605.4732230884.

The spelling of 221965166 in words is "two hundred twenty-one million, nine hundred sixty-five thousand, one hundred sixty-six".