264889665 has 24 divisors (see below), whose sum is σ = 486151848. Its totient is φ = 132963840.

The previous prime is 264889661. The next prime is 264889717. The reversal of 264889665 is 566988462.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 85544001 + 179345664 = 9249^2 + 13392^2 .

It is not a de Polignac number, because 264889665 - 2² = 264889661 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (264889661) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 172366 + ... + 173895.

It is an arithmetic number, because the mean of its divisors is an integer number (20256327).

Almost surely, 2^264889665 is an apocalyptic number.

It is an amenable number.

264889665 is a deficient number, since it is larger than the sum of its proper divisors (221262183).

264889665 is a wasteful number, since it uses less digits than its factorization.

264889665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346289 (or 346286 counting only the distinct ones).

The product of its digits is 4976640, while the sum is 54.

The square root of 264889665 is about 16275.4313306898. The cubic root of 264889665 is about 642.2266719317.

The spelling of 264889665 in words is "two hundred sixty-four million, eight hundred eighty-nine thousand, six hundred sixty-five".