665248659 has 8 divisors (see below), whose sum is σ = 902032320. Its totient is φ = 435982056.

The previous prime is 665248637. The next prime is 665248679. The reversal of 665248659 is 956842566.

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

It is not a de Polignac number, because 665248659 - 2⁵ = 665248627 is a prime.

It is not an unprimeable number, because it can be changed into a prime (665248679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1879057 + ... + 1879410.

It is an arithmetic number, because the mean of its divisors is an integer number (112754040).

Almost surely, 2^665248659 is an apocalyptic number.

665248659 is a deficient number, since it is larger than the sum of its proper divisors (236783661).

665248659 is a wasteful number, since it uses less digits than its factorization.

665248659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3758529.

The product of its digits is 3110400, while the sum is 51.

The square root of 665248659 is about 25792.4147570560. The cubic root of 665248659 is about 872.9606531814.

The spelling of 665248659 in words is "six hundred sixty-five million, two hundred forty-eight thousand, six hundred fifty-nine".