22225661 has 2 divisors, whose sum is σ = 22225662. Its totient is φ = 22225660.

The previous prime is 22225639. The next prime is 22225663. The reversal of 22225661 is 16652222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21576025 + 649636 = 4645^2 + 806^2 .

It is a cyclic number.

It is not a de Polignac number, because 22225661 - 2⁶ = 22225597 is a prime.

Together with 22225663, it forms a pair of twin primes.

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 22225661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22225663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11112830 + 11112831.

It is an arithmetic number, because the mean of its divisors is an integer number (11112831).

Almost surely, 2^22225661 is an apocalyptic number.

It is an amenable number.

22225661 is a deficient number, since it is larger than the sum of its proper divisors (1).

22225661 is an equidigital number, since it uses as much as digits as its factorization.

22225661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2880, while the sum is 26.

The square root of 22225661 is about 4714.4099312639. The cubic root of 22225661 is about 281.1587229068.

Adding to 22225661 its reverse (16652222), we get a palindrome (38877883).

The spelling of 22225661 in words is "twenty-two million, two hundred twenty-five thousand, six hundred sixty-one".