643108110765 has 32 divisors (see below), whose sum is σ = 1046473261056. Its totient is φ = 337185414720.

The previous prime is 643108110727. The next prime is 643108110769. The reversal of 643108110765 is 567011801346.

643108110765 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 643108110765 - 2⁸ = 643108110509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643108110769) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 500557 + ... + 1239666.

It is an arithmetic number, because the mean of its divisors is an integer number (32702289408).

Almost surely, 2^643108110765 is an apocalyptic number.

It is an amenable number.

643108110765 is a deficient number, since it is larger than the sum of its proper divisors (403365150291).

643108110765 is a wasteful number, since it uses less digits than its factorization.

643108110765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1740649.

The product of its (nonzero) digits is 120960, while the sum is 42.

The spelling of 643108110765 in words is "six hundred forty-three billion, one hundred eight million, one hundred ten thousand, seven hundred sixty-five".