265863985 has 4 divisors (see below), whose sum is σ = 319036788. Its totient is φ = 212691184.

The previous prime is 265863977. The next prime is 265864013. The reversal of 265863985 is 589368562.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 91412721 + 174451264 = 9561^2 + 13208^2 .

It is a cyclic number.

It is not a de Polignac number, because 265863985 - 2³ = 265863977 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26586394 + ... + 26586403.

It is an arithmetic number, because the mean of its divisors is an integer number (79759197).

Almost surely, 2^265863985 is an apocalyptic number.

It is an amenable number.

265863985 is a deficient number, since it is larger than the sum of its proper divisors (53172803).

265863985 is an equidigital number, since it uses as much as digits as its factorization.

265863985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53172802.

The product of its digits is 3110400, while the sum is 52.

The square root of 265863985 is about 16305.3360897591. The cubic root of 265863985 is about 643.0131234790.

The spelling of 265863985 in words is "two hundred sixty-five million, eight hundred sixty-three thousand, nine hundred eighty-five".