665505359 has 2 divisors, whose sum is σ = 665505360. Its totient is φ = 665505358.

The previous prime is 665505349. The next prime is 665505397. The reversal of 665505359 is 953505566.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-665505359 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665505349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332752679 + 332752680.

It is an arithmetic number, because the mean of its divisors is an integer number (332752680).

Almost surely, 2^665505359 is an apocalyptic number.

665505359 is a deficient number, since it is larger than the sum of its proper divisors (1).

665505359 is an equidigital number, since it uses as much as digits as its factorization.

665505359 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 607500, while the sum is 44.

The square root of 665505359 is about 25797.3905463324. The cubic root of 665505359 is about 873.0729220699.

The spelling of 665505359 in words is "six hundred sixty-five million, five hundred five thousand, three hundred fifty-nine".