221665675 has 24 divisors (see below), whose sum is σ = 342692352. Its totient is φ = 138180000.

The previous prime is 221665657. The next prime is 221665679. The reversal of 221665675 is 576566122.

It is not a de Polignac number, because 221665675 - 2⁹ = 221665163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221665679) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 55651 + ... + 59500.

It is an arithmetic number, because the mean of its divisors is an integer number (14278848).

Almost surely, 2^221665675 is an apocalyptic number.

221665675 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

221665675 is a deficient number, since it is larger than the sum of its proper divisors (121026677).

221665675 is a wasteful number, since it uses less digits than its factorization.

221665675 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115179 (or 115174 counting only the distinct ones).

The product of its digits is 151200, while the sum is 40.

The square root of 221665675 is about 14888.4409862148. The cubic root of 221665675 is about 605.2007848471.

The spelling of 221665675 in words is "two hundred twenty-one million, six hundred sixty-five thousand, six hundred seventy-five".