266036131661 has 2 divisors, whose sum is σ = 266036131662. Its totient is φ = 266036131660.

The previous prime is 266036131639. The next prime is 266036131663. The reversal of 266036131661 is 166131630662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 147360015625 + 118676116036 = 383875^2 + 344494^2 .

It is a cyclic number.

It is not a de Polignac number, because 266036131661 - 2³⁰ = 264962389837 is a prime.

Together with 266036131663, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266036131663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133018065830 + 133018065831.

It is an arithmetic number, because the mean of its divisors is an integer number (133018065831).

Almost surely, 2^266036131661 is an apocalyptic number.

It is an amenable number.

266036131661 is a deficient number, since it is larger than the sum of its proper divisors (1).

266036131661 is an equidigital number, since it uses as much as digits as its factorization.

266036131661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 139968, while the sum is 41.

The spelling of 266036131661 in words is "two hundred sixty-six billion, thirty-six million, one hundred thirty-one thousand, six hundred sixty-one".