22163661 has 12 divisors (see below), whose sum is σ = 34476988. Its totient is φ = 13639104.

The previous prime is 22163641. The next prime is 22163663. The reversal of 22163661 is 16636122.

22163661 is a `hidden beast` number, since 2 + 21 + 636 + 6 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 12744900 + 9418761 = 3570^2 + 3069^2 .

It is not a de Polignac number, because 22163661 - 2⁹ = 22163149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22163663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 94600 + ... + 94833.

Almost surely, 2^22163661 is an apocalyptic number.

It is an amenable number.

22163661 is a deficient number, since it is larger than the sum of its proper divisors (12313327).

22163661 is a wasteful number, since it uses less digits than its factorization.

22163661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189452 (or 189449 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 22163661 is about 4707.8297547809. The cubic root of 22163661 is about 280.8970422742.

Adding to 22163661 its reverse (16636122), we get a palindrome (38799783).

The spelling of 22163661 in words is "twenty-two million, one hundred sixty-three thousand, six hundred sixty-one".