266605481 has 2 divisors, whose sum is σ = 266605482. Its totient is φ = 266605480.

The previous prime is 266605477. The next prime is 266605501. The reversal of 266605481 is 184506662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 266505625 + 99856 = 16325^2 + 316^2 .

It is a cyclic number.

It is not a de Polignac number, because 266605481 - 2² = 266605477 is a prime.

It is a super-2 number, since 2×266605481² = 142156964998482722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is equal to p_14536586 and since 266605481 and 14536586 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (266608481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133302740 + 133302741.

It is an arithmetic number, because the mean of its divisors is an integer number (133302741).

Almost surely, 2^266605481 is an apocalyptic number.

It is an amenable number.

266605481 is a deficient number, since it is larger than the sum of its proper divisors (1).

266605481 is an equidigital number, since it uses as much as digits as its factorization.

266605481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69120, while the sum is 38.

The square root of 266605481 is about 16328.0580902935. The cubic root of 266605481 is about 643.6103575451.

The spelling of 266605481 in words is "two hundred sixty-six million, six hundred five thousand, four hundred eighty-one".