664585204646 has 16 divisors (see below), whose sum is σ = 1089980305920. Its totient is φ = 301396060680.

The previous prime is 664585204567. The next prime is 664585204667. The reversal of 664585204646 is 646402585466.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 664585204591 and 664585204600.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34396286 + ... + 34415601.

It is an arithmetic number, because the mean of its divisors is an integer number (68123769120).

Almost surely, 2^664585204646 is an apocalyptic number.

664585204646 is a deficient number, since it is larger than the sum of its proper divisors (425395101274).

664585204646 is a wasteful number, since it uses less digits than its factorization.

664585204646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68812339.

The product of its (nonzero) digits is 33177600, while the sum is 56.

The spelling of 664585204646 in words is "six hundred sixty-four billion, five hundred eighty-five million, two hundred four thousand, six hundred forty-six".