321607663 has 8 divisors (see below), whose sum is σ = 355707968. Its totient is φ = 288844704.

The previous prime is 321607633. The next prime is 321607667. The reversal of 321607663 is 366706123.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 321607663 - 2⁵ = 321607631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321607667) by changing a digit.

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, 333831 + ... + 334792.

It is an arithmetic number, because the mean of its divisors is an integer number (44463496).

Almost surely, 2^321607663 is an apocalyptic number.

321607663 is a deficient number, since it is larger than the sum of its proper divisors (34100305).

321607663 is a wasteful number, since it uses less digits than its factorization.

321607663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 668673.

The product of its (nonzero) digits is 27216, while the sum is 34.

The square root of 321607663 is about 17933.4230697879. The cubic root of 321607663 is about 685.1339095656.

The spelling of 321607663 in words is "three hundred twenty-one million, six hundred seven thousand, six hundred sixty-three".