222186661 has 8 divisors (see below), whose sum is σ = 230208120. Its totient is φ = 214189248.

The previous prime is 222186659. The next prime is 222186691. The reversal of 222186661 is 166681222.

It can be written as a sum of positive squares in 4 ways, for example, as 170433025 + 51753636 = 13055^2 + 7194^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 222186661 - 2¹ = 222186659 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 (222186691) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13975 + ... + 25291.

It is an arithmetic number, because the mean of its divisors is an integer number (28776015).

Almost surely, 2^222186661 is an apocalyptic number.

It is an amenable number.

222186661 is a deficient number, since it is larger than the sum of its proper divisors (8021459).

222186661 is a wasteful number, since it uses less digits than its factorization.

222186661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12023.

The product of its digits is 13824, while the sum is 34.

The square root of 222186661 is about 14905.9270426230. The cubic root of 222186661 is about 605.6745530392.

The spelling of 222186661 in words is "two hundred twenty-two million, one hundred eighty-six thousand, six hundred sixty-one".