266563697 has 2 divisors, whose sum is σ = 266563698. Its totient is φ = 266563696.

The previous prime is 266563681. The next prime is 266563747. The reversal of 266563697 is 796365662.

It is an a-pointer prime, because the next prime (266563747) can be obtained adding 266563697 to its sum of digits (50).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 259886641 + 6677056 = 16121^2 + 2584^2 .

It is a cyclic number.

It is not a de Polignac number, because 266563697 - 2⁴ = 266563681 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (266563397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133281848 + 133281849.

It is an arithmetic number, because the mean of its divisors is an integer number (133281849).

Almost surely, 2^266563697 is an apocalyptic number.

It is an amenable number.

266563697 is a deficient number, since it is larger than the sum of its proper divisors (1).

266563697 is an equidigital number, since it uses as much as digits as its factorization.

266563697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2449440, while the sum is 50.

The square root of 266563697 is about 16326.7785248652. The cubic root of 266563697 is about 643.5767323047.

The spelling of 266563697 in words is "two hundred sixty-six million, five hundred sixty-three thousand, six hundred ninety-seven".