266506553 has 2 divisors, whose sum is σ = 266506554. Its totient is φ = 266506552.

The previous prime is 266506517. The next prime is 266506573. The reversal of 266506553 is 355605662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 215854864 + 50651689 = 14692^2 + 7117^2 .

It is a cyclic number.

It is not a de Polignac number, because 266506553 - 2⁶ = 266506489 is a prime.

It is not a weakly prime, because it can be changed into another prime (266506573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133253276 + 133253277.

It is an arithmetic number, because the mean of its divisors is an integer number (133253277).

Almost surely, 2^266506553 is an apocalyptic number.

It is an amenable number.

266506553 is a deficient number, since it is larger than the sum of its proper divisors (1).

266506553 is an equidigital number, since it uses as much as digits as its factorization.

266506553 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162000, while the sum is 38.

The square root of 266506553 is about 16325.0284226399. The cubic root of 266506553 is about 643.5307405743.

The spelling of 266506553 in words is "two hundred sixty-six million, five hundred six thousand, five hundred fifty-three".