1321799668 has 24 divisors (see below), whose sum is σ = 2647746752. Its totient is φ = 565596864.

The previous prime is 1321799641. The next prime is 1321799681. The reversal of 1321799668 is 8669971231.

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 (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18705 + ... + 54712.

Almost surely, 2^1321799668 is an apocalyptic number.

It is an amenable number.

1321799668 is an abundant number, since it is smaller than the sum of its proper divisors (1325947084).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1321799668 is a wasteful number, since it uses less digits than its factorization.

1321799668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74071 (or 74069 counting only the distinct ones).

The product of its digits is 979776, while the sum is 52.

The square root of 1321799668 is about 36356.5629288578. The cubic root of 1321799668 is about 1097.4596109067.

The spelling of 1321799668 in words is "one billion, three hundred twenty-one million, seven hundred ninety-nine thousand, six hundred sixty-eight".