665269289 has 4 divisors (see below), whose sum is σ = 668124756. Its totient is φ = 662413824.

The previous prime is 665269277. The next prime is 665269327. The reversal of 665269289 is 982962566.

It is a happy number.

665269289 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 130873600 + 534395689 = 11440^2 + 23117^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-665269289 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 665269289.

It is not an unprimeable number, because it can be changed into a prime (665269229) 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, 1427384 + ... + 1427849.

It is an arithmetic number, because the mean of its divisors is an integer number (167031189).

Almost surely, 2^665269289 is an apocalyptic number.

It is an amenable number.

665269289 is a deficient number, since it is larger than the sum of its proper divisors (2855467).

665269289 is a wasteful number, since it uses less digits than its factorization.

665269289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2855466.

The product of its digits is 2799360, while the sum is 53.

The square root of 665269289 is about 25792.8146777353. The cubic root of 665269289 is about 872.9696768709.

The spelling of 665269289 in words is "six hundred sixty-five million, two hundred sixty-nine thousand, two hundred eighty-nine".