664581416326 has 16 divisors (see below), whose sum is σ = 1013939182080. Its totient is φ = 326649697920.

The previous prime is 664581416309. The next prime is 664581416333. The reversal of 664581416326 is 623614185466.

It is a happy number.

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 7 ways as a sum of consecutive naturals, for example, 11974435 + ... + 12029806.

It is an arithmetic number, because the mean of its divisors is an integer number (63371198880).

Almost surely, 2^664581416326 is an apocalyptic number.

664581416326 is a deficient number, since it is larger than the sum of its proper divisors (349357765754).

664581416326 is a wasteful number, since it uses less digits than its factorization.

664581416326 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24004479.

The product of its digits is 4976640, while the sum is 52.

The spelling of 664581416326 in words is "six hundred sixty-four billion, five hundred eighty-one million, four hundred sixteen thousand, three hundred twenty-six".