643342475 has 24 divisors (see below), whose sum is σ = 847834128. Its totient is φ = 482585600.

The previous prime is 643342471. The next prime is 643342477. The reversal of 643342475 is 574243346.

It is not a de Polignac number, because 643342475 - 2² = 643342471 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (643342471) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 116732 + ... + 122118.

It is an arithmetic number, because the mean of its divisors is an integer number (35326422).

Almost surely, 2^643342475 is an apocalyptic number.

643342475 is a deficient number, since it is larger than the sum of its proper divisors (204491653).

643342475 is a wasteful number, since it uses less digits than its factorization.

643342475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5695 (or 5690 counting only the distinct ones).

The product of its digits is 241920, while the sum is 38.

The square root of 643342475 is about 25364.1967150549. The cubic root of 643342475 is about 863.2715101929.

The spelling of 643342475 in words is "six hundred forty-three million, three hundred forty-two thousand, four hundred seventy-five".