265478959 has 4 divisors (see below), whose sum is σ = 272654104. Its totient is φ = 258303816.

The previous prime is 265478957. The next prime is 265478971. The reversal of 265478959 is 959874562.

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 265478959 - 2¹ = 265478957 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 (265478951) 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, 3587517 + ... + 3587590.

It is an arithmetic number, because the mean of its divisors is an integer number (68163526).

Almost surely, 2^265478959 is an apocalyptic number.

265478959 is a deficient number, since it is larger than the sum of its proper divisors (7175145).

265478959 is an equidigital number, since it uses as much as digits as its factorization.

265478959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7175144.

The product of its digits is 5443200, while the sum is 55.

The square root of 265478959 is about 16293.5250636564. The cubic root of 265478959 is about 642.7025682136.

The spelling of 265478959 in words is "two hundred sixty-five million, four hundred seventy-eight thousand, nine hundred fifty-nine".