22005666 has 12 divisors (see below), whose sum is σ = 47678982. Its totient is φ = 7335216.

The previous prime is 22005649. The next prime is 22005673. The reversal of 22005666 is 66650022.

It can be written as a sum of positive squares in only one way, i.e., 12215025 + 9790641 = 3495^2 + 3129^2 .

It is a super-2 number, since 2×22005666² = 968498672207112, which contains 22 as substring.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 611251 + ... + 611286.

Almost surely, 2^22005666 is an apocalyptic number.

22005666 is an abundant number, since it is smaller than the sum of its proper divisors (25673316).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

22005666 is a wasteful number, since it uses less digits than its factorization.

22005666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1222545 (or 1222542 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 22005666 is about 4691.0197185687. The cubic root of 22005666 is about 280.2279860838.

Adding to 22005666 its reverse (66650022), we get a palindrome (88655688).

The spelling of 22005666 in words is "twenty-two million, five thousand, six hundred sixty-six".