265666945 has 4 divisors (see below), whose sum is σ = 318800340. Its totient is φ = 212533552.

The previous prime is 265666867. The next prime is 265666963. The reversal of 265666945 is 549666562.

265666945 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 549666562 = 2 ⋅274833281.

It can be written as a sum of positive squares in 2 ways, for example, as 83740801 + 181926144 = 9151^2 + 13488^2 .

It is a cyclic number.

It is not a de Polignac number, because 265666945 - 2⁹ = 265666433 is a prime.

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, 26566690 + ... + 26566699.

It is an arithmetic number, because the mean of its divisors is an integer number (79700085).

Almost surely, 2^265666945 is an apocalyptic number.

It is an amenable number.

265666945 is a deficient number, since it is larger than the sum of its proper divisors (53133395).

265666945 is an equidigital number, since it uses as much as digits as its factorization.

265666945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53133394.

The product of its digits is 2332800, while the sum is 49.

The square root of 265666945 is about 16299.2927760685. The cubic root of 265666945 is about 642.8542319327.

The spelling of 265666945 in words is "two hundred sixty-five million, six hundred sixty-six thousand, nine hundred forty-five".