321660420647 has 8 divisors (see below), whose sum is σ = 332760414000. Its totient is φ = 310560977664.

The previous prime is 321660420623. The next prime is 321660420677. The reversal of 321660420647 is 746024066123.

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 321660420647 - 2⁸ = 321660420391 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 (321660420677) by changing a digit.

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, 1309604 + ... + 1535702.

It is an arithmetic number, because the mean of its divisors is an integer number (41595051750).

Almost surely, 2^321660420647 is an apocalyptic number.

321660420647 is a deficient number, since it is larger than the sum of its proper divisors (11099993353).

321660420647 is a wasteful number, since it uses less digits than its factorization.

321660420647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275185.

The product of its (nonzero) digits is 290304, while the sum is 41.

The spelling of 321660420647 in words is "three hundred twenty-one billion, six hundred sixty million, four hundred twenty thousand, six hundred forty-seven".