321640136433 has 72 divisors (see below), whose sum is σ = 591093210240. Its totient is φ = 166655280960.

The previous prime is 321640136369. The next prime is 321640136443. The reversal of 321640136433 is 334631046123.

321640136433 is a `hidden beast` number, since 3 + 2 + 1 + 6 + 4 + 0 + 1 + 3 + 643 + 3 = 666.

It is not a de Polignac number, because 321640136433 - 2⁶ = 321640136369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (321640136443) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1801816 + ... + 1972262.

It is an arithmetic number, because the mean of its divisors is an integer number (8209627920).

Almost surely, 2^321640136433 is an apocalyptic number.

321640136433 is a gapful number since it is divisible by the number (33) formed by its first and last digit.

It is an amenable number.

321640136433 is a deficient number, since it is larger than the sum of its proper divisors (269453073807).

321640136433 is a wasteful number, since it uses less digits than its factorization.

321640136433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170867 (or 170857 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 36.

The spelling of 321640136433 in words is "three hundred twenty-one billion, six hundred forty million, one hundred thirty-six thousand, four hundred thirty-three".