643666751112 has 64 divisors (see below), whose sum is σ = 2006234035200. Its totient is φ = 167186168640.

The previous prime is 643666751087. The next prime is 643666751179. The reversal of 643666751112 is 211157666346.

643666751112 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 174150412 + ... + 174154107.

It is an arithmetic number, because the mean of its divisors is an integer number (31347406800).

Almost surely, 2^643666751112 is an apocalyptic number.

It is an amenable number.

643666751112 is an abundant number, since it is smaller than the sum of its proper divisors (1362567284088).

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

643666751112 is a wasteful number, since it uses less digits than its factorization.

643666751112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348304546 (or 348304542 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 48.

The spelling of 643666751112 in words is "six hundred forty-three billion, six hundred sixty-six million, seven hundred fifty-one thousand, one hundred twelve".