22066861 has 2 divisors, whose sum is σ = 22066862. Its totient is φ = 22066860.

The previous prime is 22066859. The next prime is 22066903. The reversal of 22066861 is 16866022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17682025 + 4384836 = 4205^2 + 2094^2 .

It is a cyclic number.

It is not a de Polignac number, because 22066861 - 2¹ = 22066859 is a prime.

Together with 22066859, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22066801) 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, 11033430 + 11033431.

It is an arithmetic number, because the mean of its divisors is an integer number (11033431).

Almost surely, 2^22066861 is an apocalyptic number.

It is an amenable number.

22066861 is a deficient number, since it is larger than the sum of its proper divisors (1).

22066861 is an equidigital number, since it uses as much as digits as its factorization.

22066861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 22066861 is about 4697.5377592948. The cubic root of 22066861 is about 280.4875053084.

It can be divided in two parts, 220 and 66861, that added together give a square (67081 = 259²).

The spelling of 22066861 in words is "twenty-two million, sixty-six thousand, eight hundred sixty-one".