665647384 has 16 divisors (see below), whose sum is σ = 1263127320. Its totient is φ = 328813440.

The previous prime is 665647379. The next prime is 665647399. The reversal of 665647384 is 483746566.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 500577 + ... + 501904.

Almost surely, 2^665647384 is an apocalyptic number.

It is an amenable number.

665647384 is a deficient number, since it is larger than the sum of its proper divisors (597479936).

665647384 is a wasteful number, since it uses less digits than its factorization.

665647384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1002570 (or 1002566 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 49.

The square root of 665647384 is about 25800.1431003783. The cubic root of 665647384 is about 873.1350249318.

The spelling of 665647384 in words is "six hundred sixty-five million, six hundred forty-seven thousand, three hundred eighty-four".