266495805 has 64 divisors (see below), whose sum is σ = 503884800. Its totient is φ = 133254720.

The previous prime is 266495759. The next prime is 266495813. The reversal of 266495805 is 508594662.

266495805 is a `hidden beast` number, since 2 + 6 + 64 + 9 + 580 + 5 = 666.

It is not a de Polignac number, because 266495805 - 2⁹ = 266495293 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 273970 + ... + 274940.

It is an arithmetic number, because the mean of its divisors is an integer number (7873200).

Almost surely, 2^266495805 is an apocalyptic number.

It is an amenable number.

266495805 is a deficient number, since it is larger than the sum of its proper divisors (237388995).

266495805 is a wasteful number, since it uses less digits than its factorization.

266495805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1111 (or 1105 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 45.

The square root of 266495805 is about 16324.6992315326. The cubic root of 266495805 is about 643.5220894282.

The spelling of 266495805 in words is "two hundred sixty-six million, four hundred ninety-five thousand, eight hundred five".