266132261 has 2 divisors, whose sum is σ = 266132262. Its totient is φ = 266132260.

The previous prime is 266132257. The next prime is 266132281. The reversal of 266132261 is 162231662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 253924225 + 12208036 = 15935^2 + 3494^2 .

It is a cyclic number.

It is not a de Polignac number, because 266132261 - 2² = 266132257 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266132281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133066130 + 133066131.

It is an arithmetic number, because the mean of its divisors is an integer number (133066131).

Almost surely, 2^266132261 is an apocalyptic number.

It is an amenable number.

266132261 is a deficient number, since it is larger than the sum of its proper divisors (1).

266132261 is an equidigital number, since it uses as much as digits as its factorization.

266132261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 29.

The square root of 266132261 is about 16313.5606475104. The cubic root of 266132261 is about 643.2293330292.

The spelling of 266132261 in words is "two hundred sixty-six million, one hundred thirty-two thousand, two hundred sixty-one".