643335143244 has 24 divisors (see below), whose sum is σ = 1501253495280. Its totient is φ = 214425310464.

The previous prime is 643335143233. The next prime is 643335143251. The reversal of 643335143244 is 442341533346.

It is a junction number, because it is equal to n+sod(n) for n = 643335143196 and 643335143205.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2331049 + ... + 2592384.

It is an arithmetic number, because the mean of its divisors is an integer number (62552228970).

Almost surely, 2^643335143244 is an apocalyptic number.

It is an amenable number.

643335143244 is an abundant number, since it is smaller than the sum of its proper divisors (857918352036).

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

643335143244 is a wasteful number, since it uses less digits than its factorization.

643335143244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4934329 (or 4934327 counting only the distinct ones).

The product of its digits is 1244160, while the sum is 42.

The spelling of 643335143244 in words is "six hundred forty-three billion, three hundred thirty-five million, one hundred forty-three thousand, two hundred forty-four".