265005663 has 16 divisors (see below), whose sum is σ = 380835840. Its totient is φ = 162945504.

The previous prime is 265005659. The next prime is 265005691. The reversal of 265005663 is 366500562.

It is not a de Polignac number, because 265005663 - 2² = 265005659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (265000663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66670 + ... + 70532.

It is an arithmetic number, because the mean of its divisors is an integer number (23802240).

Almost surely, 2^265005663 is an apocalyptic number.

265005663 is a deficient number, since it is larger than the sum of its proper divisors (115830177).

265005663 is a wasteful number, since it uses less digits than its factorization.

265005663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5638.

The product of its (nonzero) digits is 32400, while the sum is 33.

The square root of 265005663 is about 16278.9945328328. The cubic root of 265005663 is about 642.3204042130.

The spelling of 265005663 in words is "two hundred sixty-five million, five thousand, six hundred sixty-three".