643524563 has 16 divisors (see below), whose sum is σ = 716284512. Its totient is φ = 573216000.

The previous prime is 643524523. The next prime is 643524571. The reversal of 643524563 is 365425346.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 643524563 - 2⁶ = 643524499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (643524523) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 186845 + ... + 190257.

It is an arithmetic number, because the mean of its divisors is an integer number (44767782).

Almost surely, 2^643524563 is an apocalyptic number.

643524563 is a deficient number, since it is larger than the sum of its proper divisors (72759949).

643524563 is a wasteful number, since it uses less digits than its factorization.

643524563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3766.

The product of its digits is 259200, while the sum is 38.

The square root of 643524563 is about 25367.7859301911. The cubic root of 643524563 is about 863.3529476652.

The spelling of 643524563 in words is "six hundred forty-three million, five hundred twenty-four thousand, five hundred sixty-three".