266560817 has 2 divisors, whose sum is σ = 266560818. Its totient is φ = 266560816.

The previous prime is 266560783. The next prime is 266560843. The reversal of 266560817 is 718065662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 242393761 + 24167056 = 15569^2 + 4916^2 .

It is a cyclic number.

It is not a de Polignac number, because 266560817 - 2¹² = 266556721 is a prime.

It is not a weakly prime, because it can be changed into another prime (266560417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133280408 + 133280409.

It is an arithmetic number, because the mean of its divisors is an integer number (133280409).

Almost surely, 2^266560817 is an apocalyptic number.

It is an amenable number.

266560817 is a deficient number, since it is larger than the sum of its proper divisors (1).

266560817 is an equidigital number, since it uses as much as digits as its factorization.

266560817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120960, while the sum is 41.

The square root of 266560817 is about 16326.6903259663. The cubic root of 266560817 is about 643.5744145251.

The spelling of 266560817 in words is "two hundred sixty-six million, five hundred sixty thousand, eight hundred seventeen".