265550399 has 4 divisors (see below), whose sum is σ = 272027280. Its totient is φ = 259073520.

The previous prime is 265550393. The next prime is 265550447. The reversal of 265550399 is 993055562.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 265550399 - 2²⁰ = 264501823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (265550393) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3238379 + ... + 3238460.

It is an arithmetic number, because the mean of its divisors is an integer number (68006820).

Almost surely, 2^265550399 is an apocalyptic number.

265550399 is a deficient number, since it is larger than the sum of its proper divisors (6476881).

265550399 is an equidigital number, since it uses as much as digits as its factorization.

265550399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6476880.

The product of its (nonzero) digits is 364500, while the sum is 44.

The square root of 265550399 is about 16295.7171980861. The cubic root of 265550399 is about 642.7602131506.

The spelling of 265550399 in words is "two hundred sixty-five million, five hundred fifty thousand, three hundred ninety-nine".