22201661609 has 2 divisors, whose sum is σ = 22201661610. Its totient is φ = 22201661608.

The previous prime is 22201661597. The next prime is 22201661611. The reversal of 22201661609 is 90616610222.

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., 22082851609 + 118810000 = 148603^2 + 10900^2 .

It is a cyclic number.

It is not a de Polignac number, because 22201661609 - 2⁴ = 22201661593 is a prime.

Together with 22201661611, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (22201061609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11100830804 + 11100830805.

It is an arithmetic number, because the mean of its divisors is an integer number (11100830805).

Almost surely, 2^22201661609 is an apocalyptic number.

It is an amenable number.

22201661609 is a deficient number, since it is larger than the sum of its proper divisors (1).

22201661609 is an equidigital number, since it uses as much as digits as its factorization.

22201661609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 35.

The spelling of 22201661609 in words is "twenty-two billion, two hundred one million, six hundred sixty-one thousand, six hundred nine".