222165661 has 8 divisors (see below), whose sum is σ = 223985664. Its totient is φ = 220352880.

The previous prime is 222165659. The next prime is 222165667. The reversal of 222165661 is 166561222.

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

It is not a de Polignac number, because 222165661 - 2¹ = 222165659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222165667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71635 + ... + 74671.

It is an arithmetic number, because the mean of its divisors is an integer number (27998208).

Almost surely, 2^222165661 is an apocalyptic number.

It is an amenable number.

222165661 is a deficient number, since it is larger than the sum of its proper divisors (1820003).

222165661 is a wasteful number, since it uses less digits than its factorization.

222165661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3611.

The product of its digits is 8640, while the sum is 31.

The square root of 222165661 is about 14905.2226082001. Note that the first 3 decimals coincide. The cubic root of 222165661 is about 605.6554706360.

The spelling of 222165661 in words is "two hundred twenty-two million, one hundred sixty-five thousand, six hundred sixty-one".