265378561 has 12 divisors (see below), whose sum is σ = 309049668. Its totient is φ = 227213952.

The previous prime is 265378559. The next prime is 265378583. The reversal of 265378561 is 165873562.

265378561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 94945536 + 170433025 = 9744^2 + 13055^2 .

It is not a de Polignac number, because 265378561 - 2¹ = 265378559 is a prime.

It is a Duffinian number.

Its product of digits (302400) is a multiple of the sum of its prime factors (6048).

It is not an unprimeable number, because it can be changed into a prime (265378501) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 51285 + ... + 56221.

It is an arithmetic number, because the mean of its divisors is an integer number (25754139).

Almost surely, 2^265378561 is an apocalyptic number.

It is an amenable number.

265378561 is a deficient number, since it is larger than the sum of its proper divisors (43671107).

265378561 is a wasteful number, since it uses less digits than its factorization.

265378561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6048 (or 6041 counting only the distinct ones).

The product of its digits is 302400, while the sum is 43.

The square root of 265378561 is about 16290.4438552177. The cubic root of 265378561 is about 642.6215395846.

The spelling of 265378561 in words is "two hundred sixty-five million, three hundred seventy-eight thousand, five hundred sixty-one".