266055865 has 16 divisors (see below), whose sum is σ = 338703120. Its totient is φ = 199936000.

The previous prime is 266055859. The next prime is 266055893. The reversal of 266055865 is 568550662.

It can be written as a sum of positive squares in 8 ways, for example, as 12482089 + 253573776 = 3533^2 + 15924^2 .

It is not a de Polignac number, because 266055865 - 2⁹ = 266055353 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45615 + ... + 51115.

It is an arithmetic number, because the mean of its divisors is an integer number (21168945).

Almost surely, 2^266055865 is an apocalyptic number.

It is an amenable number.

266055865 is a deficient number, since it is larger than the sum of its proper divisors (72647255).

266055865 is a wasteful number, since it uses less digits than its factorization.

266055865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6092.

The product of its (nonzero) digits is 432000, while the sum is 43.

The square root of 266055865 is about 16311.2189918473. The cubic root of 266055865 is about 643.1677786092.

The spelling of 266055865 in words is "two hundred sixty-six million, fifty-five thousand, eight hundred sixty-five".