321381475816 has 32 divisors (see below), whose sum is σ = 607601120040. Its totient is φ = 159359194368.

The previous prime is 321381475801. The next prime is 321381475817. The reversal of 321381475816 is 618574183123.

It can be written as a sum of positive squares in 4 ways, for example, as 308235936100 + 13145539716 = 555190^2 + 114654^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 321381475816.

It is not an unprimeable number, because it can be changed into a prime (321381475817) 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, 256990 + ... + 841906.

Almost surely, 2^321381475816 is an apocalyptic number.

It is an amenable number.

321381475816 is a deficient number, since it is larger than the sum of its proper divisors (286219644224).

321381475816 is a wasteful number, since it uses less digits than its factorization.

321381475816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 585493 (or 585489 counting only the distinct ones).

The product of its digits is 967680, while the sum is 49.

The spelling of 321381475816 in words is "three hundred twenty-one billion, three hundred eighty-one million, four hundred seventy-five thousand, eight hundred sixteen".