22180661 has 2 divisors, whose sum is σ = 22180662. Its totient is φ = 22180660.

The previous prime is 22180607. The next prime is 22180687. The reversal of 22180661 is 16608122.

It is an a-pointer prime, because the next prime (22180687) can be obtained adding 22180661 to its sum of digits (26).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22146436 + 34225 = 4706^2 + 185^2 .

It is a cyclic number.

It is not a de Polignac number, because 22180661 - 2¹⁰ = 22179637 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22180661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22180601) 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 as a sum of consecutive naturals, namely, 11090330 + 11090331.

It is an arithmetic number, because the mean of its divisors is an integer number (11090331).

Almost surely, 2^22180661 is an apocalyptic number.

It is an amenable number.

22180661 is a deficient number, since it is larger than the sum of its proper divisors (1).

22180661 is an equidigital number, since it uses as much as digits as its factorization.

22180661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 22180661 is about 4709.6349115404. The cubic root of 22180661 is about 280.9688419246.

Adding to 22180661 its reverse (16608122), we get a palindrome (38788783).

The spelling of 22180661 in words is "twenty-two million, one hundred eighty thousand, six hundred sixty-one".