266542805 has 16 divisors (see below), whose sum is σ = 330829824. Its totient is φ = 205943040.

The previous prime is 266542769. The next prime is 266542819. The reversal of 266542805 is 508245662.

It is not a de Polignac number, because 266542805 - 2¹⁸ = 266280661 is a prime.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

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, 92669 + ... + 95501.

It is an arithmetic number, because the mean of its divisors is an integer number (20676864).

Almost surely, 2^266542805 is an apocalyptic number.

It is an amenable number.

266542805 is a deficient number, since it is larger than the sum of its proper divisors (64287019).

266542805 is a wasteful number, since it uses less digits than its factorization.

266542805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3476.

The product of its (nonzero) digits is 115200, while the sum is 38.

The square root of 266542805 is about 16326.1387045437. The cubic root of 266542805 is about 643.5599183667.

The spelling of 266542805 in words is "two hundred sixty-six million, five hundred forty-two thousand, eight hundred five".