266532821 has 2 divisors, whose sum is σ = 266532822. Its totient is φ = 266532820.

The previous prime is 266532803. The next prime is 266532863. The reversal of 266532821 is 128235662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 196392196 + 70140625 = 14014^2 + 8375^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-266532821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266532121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133266410 + 133266411.

It is an arithmetic number, because the mean of its divisors is an integer number (133266411).

Almost surely, 2^266532821 is an apocalyptic number.

It is an amenable number.

266532821 is a deficient number, since it is larger than the sum of its proper divisors (1).

266532821 is an equidigital number, since it uses as much as digits as its factorization.

266532821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34560, while the sum is 35.

The square root of 266532821 is about 16325.8329343406. The cubic root of 266532821 is about 643.5518829063.

The spelling of 266532821 in words is "two hundred sixty-six million, five hundred thirty-two thousand, eight hundred twenty-one".