22655557 has 2 divisors, whose sum is σ = 22655558. Its totient is φ = 22655556.

The previous prime is 22655531. The next prime is 22655569. The reversal of 22655557 is 75555622.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21288996 + 1366561 = 4614^2 + 1169^2 .

It is a cyclic number.

It is not a de Polignac number, because 22655557 - 2¹⁹ = 22131269 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22655057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11327778 + 11327779.

It is an arithmetic number, because the mean of its divisors is an integer number (11327779).

Almost surely, 2^22655557 is an apocalyptic number.

It is an amenable number.

22655557 is a deficient number, since it is larger than the sum of its proper divisors (1).

22655557 is an equidigital number, since it uses as much as digits as its factorization.

22655557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 105000, while the sum is 37.

The square root of 22655557 is about 4759.7853943219. The cubic root of 22655557 is about 282.9599139117.

The spelling of 22655557 in words is "twenty-two million, six hundred fifty-five thousand, five hundred fifty-seven".