6222066661 has 2 divisors, whose sum is σ = 6222066662. Its totient is φ = 6222066660.

The previous prime is 6222066607. The next prime is 6222066701. The reversal of 6222066661 is 1666602226.

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., 5650378561 + 571688100 = 75169^2 + 23910^2 .

It is a cyclic number.

It is not a de Polignac number, because 6222066661 - 2⁷ = 6222066533 is a prime.

It is a super-2 number, since 2×6222066661² = 77428227067855377842, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6222066661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6222066601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3111033330 + 3111033331.

It is an arithmetic number, because the mean of its divisors is an integer number (3111033331).

Almost surely, 2^6222066661 is an apocalyptic number.

It is an amenable number.

6222066661 is a deficient number, since it is larger than the sum of its proper divisors (1).

6222066661 is an equidigital number, since it uses as much as digits as its factorization.

6222066661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 37.

The square root of 6222066661 is about 78880.0777192822. The cubic root of 6222066661 is about 1839.2674562115.

Adding to 6222066661 its reverse (1666602226), we get a palindrome (7888668887).

It can be divided in two parts, 62220 and 66661, that added together give a square (128881 = 359²).

The spelling of 6222066661 in words is "six billion, two hundred twenty-two million, sixty-six thousand, six hundred sixty-one".