222544661 has 4 divisors (see below), whose sum is σ = 225593292. Its totient is φ = 219496032.

The previous prime is 222544657. The next prime is 222544681. The reversal of 222544661 is 166445222.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 166445222 = 2 ⋅83222611.

It can be written as a sum of positive squares in 2 ways, for example, as 45495025 + 177049636 = 6745^2 + 13306^2 .

It is a cyclic number.

It is not a de Polignac number, because 222544661 - 2² = 222544657 is a prime.

It is a super-2 number, since 2×222544661² = 99052252279209842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222544681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1524206 + ... + 1524351.

It is an arithmetic number, because the mean of its divisors is an integer number (56398323).

Almost surely, 2^222544661 is an apocalyptic number.

It is an amenable number.

222544661 is a deficient number, since it is larger than the sum of its proper divisors (3048631).

222544661 is an equidigital number, since it uses as much as digits as its factorization.

222544661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3048630.

The product of its digits is 23040, while the sum is 32.

The square root of 222544661 is about 14917.9308551823. The cubic root of 222544661 is about 605.9996777729. Note that the first 3 decimals are identical.

Adding to 222544661 its reverse (166445222), we get a palindrome (388989883).

The spelling of 222544661 in words is "two hundred twenty-two million, five hundred forty-four thousand, six hundred sixty-one".