222656142661 has 2 divisors, whose sum is σ = 222656142662. Its totient is φ = 222656142660.

The previous prime is 222656142623. The next prime is 222656142691. The reversal of 222656142661 is 166241656222.

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., 213726837636 + 8929305025 = 462306^2 + 94495^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-222656142661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222656142691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111328071330 + 111328071331.

It is an arithmetic number, because the mean of its divisors is an integer number (111328071331).

Almost surely, 2^222656142661 is an apocalyptic number.

It is an amenable number.

222656142661 is a deficient number, since it is larger than the sum of its proper divisors (1).

222656142661 is an equidigital number, since it uses as much as digits as its factorization.

222656142661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 414720, while the sum is 43.

Adding to 222656142661 its reverse (166241656222), we get a palindrome (388897798883).

The spelling of 222656142661 in words is "two hundred twenty-two billion, six hundred fifty-six million, one hundred forty-two thousand, six hundred sixty-one".