266222681 has 2 divisors, whose sum is σ = 266222682. Its totient is φ = 266222680.

The previous prime is 266222651. The next prime is 266222683. The reversal of 266222681 is 186222662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 221533456 + 44689225 = 14884^2 + 6685^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-266222681 is a prime.

It is a super-2 number, since 2×266222681² = 141749031757655522, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 266222683, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (266222683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133111340 + 133111341.

It is an arithmetic number, because the mean of its divisors is an integer number (133111341).

Almost surely, 2^266222681 is an apocalyptic number.

It is an amenable number.

266222681 is a deficient number, since it is larger than the sum of its proper divisors (1).

266222681 is an equidigital number, since it uses as much as digits as its factorization.

266222681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27648, while the sum is 35.

The square root of 266222681 is about 16316.3317262184. The cubic root of 266222681 is about 643.3021717630.

The spelling of 266222681 in words is "two hundred sixty-six million, two hundred twenty-two thousand, six hundred eighty-one".