266135905 has 24 divisors (see below), whose sum is σ = 374830632. Its totient is φ = 180859392.

The previous prime is 266135897. The next prime is 266135927. The reversal of 266135905 is 509531662.

It can be written as a sum of positive squares in 4 ways, for example, as 32626944 + 233508961 = 5712^2 + 15281^2 .

It is not a de Polignac number, because 266135905 - 2³ = 266135897 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22879 + ... + 32491.

It is an arithmetic number, because the mean of its divisors is an integer number (15617943).

Almost surely, 2^266135905 is an apocalyptic number.

It is an amenable number.

266135905 is a deficient number, since it is larger than the sum of its proper divisors (108694727).

266135905 is a wasteful number, since it uses less digits than its factorization.

266135905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9745 (or 9738 counting only the distinct ones).

The product of its (nonzero) digits is 48600, while the sum is 37.

The square root of 266135905 is about 16313.6723333528. The cubic root of 266135905 is about 643.2322688088.

The spelling of 266135905 in words is "two hundred sixty-six million, one hundred thirty-five thousand, nine hundred five".