665848349 has 4 divisors (see below), whose sum is σ = 687327360. Its totient is φ = 644369340.

The previous prime is 665848303. The next prime is 665848357. The reversal of 665848349 is 943848566.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-665848349 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 665848349.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665848399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10739459 + ... + 10739520.

It is an arithmetic number, because the mean of its divisors is an integer number (171831840).

Almost surely, 2^665848349 is an apocalyptic number.

It is an amenable number.

665848349 is a deficient number, since it is larger than the sum of its proper divisors (21479011).

665848349 is a wasteful number, since it uses less digits than its factorization.

665848349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21479010.

The product of its digits is 4976640, while the sum is 53.

The square root of 665848349 is about 25804.0374554061. The cubic root of 665848349 is about 873.2228852258. Note that the first 3 decimals are identical.

The spelling of 665848349 in words is "six hundred sixty-five million, eight hundred forty-eight thousand, three hundred forty-nine".