665494289 has 8 divisors (see below), whose sum is σ = 676657152. Its totient is φ = 654381280.

The previous prime is 665494243. The next prime is 665494303. The reversal of 665494289 is 982494566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 665494289 - 2⁸ = 665494033 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 665494289.

It is not an unprimeable number, because it can be changed into a prime (665494889) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14957 + ... + 39429.

It is an arithmetic number, because the mean of its divisors is an integer number (84582144).

Almost surely, 2^665494289 is an apocalyptic number.

It is an amenable number.

665494289 is a deficient number, since it is larger than the sum of its proper divisors (11162863).

665494289 is a wasteful number, since it uses less digits than its factorization.

665494289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24927.

The product of its digits is 3732480, while the sum is 53.

The square root of 665494289 is about 25797.1759888558. The cubic root of 665494289 is about 873.0680811518.

The spelling of 665494289 in words is "six hundred sixty-five million, four hundred ninety-four thousand, two hundred eighty-nine".