321555427856 has 80 divisors (see below), whose sum is σ = 725520063744. Its totient is φ = 136708196352.

The previous prime is 321555427813. The next prime is 321555427883. The reversal of 321555427856 is 658724555123.

It is a junction number, because it is equal to n+sod(n) for n = 321555427798 and 321555427807.

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 15 ways as a sum of consecutive naturals, for example, 801230 + ... + 1133613.

Almost surely, 2^321555427856 is an apocalyptic number.

It is an amenable number.

321555427856 is an abundant number, since it is smaller than the sum of its proper divisors (403964635888).

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

321555427856 is a wasteful number, since it uses less digits than its factorization.

321555427856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1934928 (or 1934922 counting only the distinct ones).

The product of its digits is 10080000, while the sum is 53.

The spelling of 321555427856 in words is "three hundred twenty-one billion, five hundred fifty-five million, four hundred twenty-seven thousand, eight hundred fifty-six".