265116321 has 20 divisors (see below), whose sum is σ = 397341252. Its totient is φ = 176162688.

The previous prime is 265116301. The next prime is 265116389. The reversal of 265116321 is 123611562.

265116321 is a `hidden beast` number, since 2 + 651 + 1 + 6 + 3 + 2 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 101787921 + 163328400 = 10089^2 + 12780^2 .

It is not a de Polignac number, because 265116321 - 2¹⁹ = 264592033 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (265116301) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 20125 + ... + 30581.

Almost surely, 2^265116321 is an apocalyptic number.

It is an amenable number.

265116321 is a deficient number, since it is larger than the sum of its proper divisors (132224931).

265116321 is a wasteful number, since it uses less digits than its factorization.

265116321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10782 (or 10773 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 265116321 is about 16282.3929752356. The cubic root of 265116321 is about 642.4097960138.

Adding to 265116321 its reverse (123611562), we get a palindrome (388727883).

The spelling of 265116321 in words is "two hundred sixty-five million, one hundred sixteen thousand, three hundred twenty-one".