665046647 has 16 divisors (see below), whose sum is σ = 736011360. Its totient is φ = 598069248.

The previous prime is 665046619. The next prime is 665046659. The reversal of 665046647 is 746640566.

It is not a de Polignac number, because 665046647 - 2¹⁸ = 664784503 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 665046598 and 665046607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665046617) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 40868 + ... + 54774.

It is an arithmetic number, because the mean of its divisors is an integer number (46000710).

Almost surely, 2^665046647 is an apocalyptic number.

665046647 is a deficient number, since it is larger than the sum of its proper divisors (70964713).

665046647 is a wasteful number, since it uses less digits than its factorization.

665046647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14050.

The product of its (nonzero) digits is 725760, while the sum is 44.

The square root of 665046647 is about 25788.4983471314. The cubic root of 665046647 is about 872.8722820246.

The spelling of 665046647 in words is "six hundred sixty-five million, forty-six thousand, six hundred forty-seven".