643769934068 has 24 divisors (see below), whose sum is σ = 1141871849664. Its totient is φ = 317542176000.

The previous prime is 643769934023. The next prime is 643769934083. The reversal of 643769934068 is 860439967346.

It is a junction number, because it is equal to n+sod(n) for n = 643769933995 and 643769934013.

It is a congruent number.

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, 2546858 + ... + 2788193.

It is an arithmetic number, because the mean of its divisors is an integer number (47577993736).

Almost surely, 2^643769934068 is an apocalyptic number.

It is an amenable number.

643769934068 is a deficient number, since it is larger than the sum of its proper divisors (498101915596).

643769934068 is a wasteful number, since it uses less digits than its factorization.

643769934068 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5335463 (or 5335461 counting only the distinct ones).

The product of its (nonzero) digits is 141087744, while the sum is 65.

The spelling of 643769934068 in words is "six hundred forty-three billion, seven hundred sixty-nine million, nine hundred thirty-four thousand, sixty-eight".