643510105275 has 48 divisors (see below), whose sum is σ = 1074517726464. Its totient is φ = 339793726080.

The previous prime is 643510105253. The next prime is 643510105289. The reversal of 643510105275 is 572501015346.

It is not a de Polignac number, because 643510105275 - 2⁸ = 643510105019 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 48792232 + ... + 48805418.

It is an arithmetic number, because the mean of its divisors is an integer number (22385785968).

Almost surely, 2^643510105275 is an apocalyptic number.

643510105275 is a deficient number, since it is larger than the sum of its proper divisors (431007621189).

643510105275 is a wasteful number, since it uses less digits than its factorization.

643510105275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19620 (or 19615 counting only the distinct ones).

The product of its (nonzero) digits is 126000, while the sum is 39.

The spelling of 643510105275 in words is "six hundred forty-three billion, five hundred ten million, one hundred five thousand, two hundred seventy-five".