321663436 has 6 divisors (see below), whose sum is σ = 562911020. Its totient is φ = 160831716.

The previous prime is 321663421. The next prime is 321663439. The reversal of 321663436 is 634366123.

It is not an unprimeable number, because it can be changed into a prime (321663439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40207926 + ... + 40207933.

Almost surely, 2^321663436 is an apocalyptic number.

It is an amenable number.

321663436 is a deficient number, since it is larger than the sum of its proper divisors (241247584).

321663436 is a wasteful number, since it uses less digits than its factorization.

321663436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80415863 (or 80415861 counting only the distinct ones).

The product of its digits is 46656, while the sum is 34.

The square root of 321663436 is about 17934.9780038895. The cubic root of 321663436 is about 685.1735124413.

The spelling of 321663436 in words is "three hundred twenty-one million, six hundred sixty-three thousand, four hundred thirty-six".