665214844 has 12 divisors (see below), whose sum is σ = 1330429744. Its totient is φ = 285092064.

The previous prime is 665214799. The next prime is 665214853. The reversal of 665214844 is 448412566.

665214844 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 665214797 and 665214806.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11878809 + ... + 11878864.

Almost surely, 2^665214844 is an apocalyptic number.

It is an amenable number.

665214844 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

665214844 is a wasteful number, since it uses less digits than its factorization.

665214844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23757684 (or 23757682 counting only the distinct ones).

The product of its digits is 184320, while the sum is 40.

The square root of 665214844 is about 25791.7592265437. The cubic root of 665214844 is about 872.9458618878.

The spelling of 665214844 in words is "six hundred sixty-five million, two hundred fourteen thousand, eight hundred forty-four".