321978586464 has 96 divisors (see below), whose sum is σ = 951968838240. Its totient is φ = 105855952896.

The previous prime is 321978586459. The next prime is 321978586469. The reversal of 321978586464 is 464685879123.

321978586464 is a `hidden beast` number, since 3 + 2 + 1 + 9 + 7 + 8 + 586 + 46 + 4 = 666.

It is an interprime number because it is at equal distance from previous prime (321978586459) and next prime (321978586469).

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321978586469) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2489397 + ... + 2615540.

It is an arithmetic number, because the mean of its divisors is an integer number (9916342065).

Almost surely, 2^321978586464 is an apocalyptic number.

It is an amenable number.

321978586464 is an abundant number, since it is smaller than the sum of its proper divisors (629990251776).

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

321978586464 is a wasteful number, since it uses less digits than its factorization.

321978586464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5105029 (or 5105015 counting only the distinct ones).

The product of its digits is 69672960, while the sum is 63.

The spelling of 321978586464 in words is "three hundred twenty-one billion, nine hundred seventy-eight million, five hundred eighty-six thousand, four hundred sixty-four".