643105975 has 12 divisors (see below), whose sum is σ = 812499336. Its totient is φ = 504776480.

The previous prime is 643105973. The next prime is 643106011. The reversal of 643105975 is 579501346.

It is not a de Polignac number, because 643105975 - 2¹ = 643105973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643105973) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 241357 + ... + 244006.

It is an arithmetic number, because the mean of its divisors is an integer number (67708278).

Almost surely, 2^643105975 is an apocalyptic number.

643105975 is a deficient number, since it is larger than the sum of its proper divisors (169393361).

643105975 is a wasteful number, since it uses less digits than its factorization.

643105975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 485426 (or 485421 counting only the distinct ones).

The product of its (nonzero) digits is 113400, while the sum is 40.

The square root of 643105975 is about 25359.5342031355. The cubic root of 643105975 is about 863.1657144243.

The spelling of 643105975 in words is "six hundred forty-three million, one hundred five thousand, nine hundred seventy-five".