222641666 has 8 divisors (see below), whose sum is σ = 359651964. Its totient is φ = 102757680.

The previous prime is 222641663. The next prime is 222641669. The reversal of 222641666 is 666146222.

It is an interprime number because it is at equal distance from previous prime (222641663) and next prime (222641669).

It can be written as a sum of positive squares in 2 ways, for example, as 172160641 + 50481025 = 13121^2 + 7105^2 .

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

It is a super-2 number, since 2×222641666² = 99138622878511112, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (222641663) 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, 4281545 + ... + 4281596.

Almost surely, 2^222641666 is an apocalyptic number.

222641666 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

222641666 is a deficient number, since it is larger than the sum of its proper divisors (137010298).

222641666 is a wasteful number, since it uses less digits than its factorization.

222641666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8563156.

The product of its digits is 41472, while the sum is 35.

The square root of 222641666 is about 14921.1817896573. The cubic root of 222641666 is about 606.0877147228.

Adding to 222641666 its reverse (666146222), we get a palindrome (888787888).

The spelling of 222641666 in words is "two hundred twenty-two million, six hundred forty-one thousand, six hundred sixty-six".