1326636664 has 16 divisors (see below), whose sum is σ = 2540368800. Its totient is φ = 649204992.

The previous prime is 1326636643. The next prime is 1326636673. The reversal of 1326636664 is 4666366231.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1326636664.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1763769 + ... + 1764520.

It is an arithmetic number, because the mean of its divisors is an integer number (158773050).

Almost surely, 2^1326636664 is an apocalyptic number.

It is an amenable number.

1326636664 is a deficient number, since it is larger than the sum of its proper divisors (1213732136).

1326636664 is a wasteful number, since it uses less digits than its factorization.

1326636664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3528342 (or 3528338 counting only the distinct ones).

The product of its digits is 559872, while the sum is 43.

The square root of 1326636664 is about 36423.0238173604. The cubic root of 1326636664 is about 1098.7966631620.

The spelling of 1326636664 in words is "one billion, three hundred twenty-six million, six hundred thirty-six thousand, six hundred sixty-four".