643566045 has 16 divisors (see below), whose sum is σ = 1062922752. Its totient is φ = 332162880.

The previous prime is 643566037. The next prime is 643566047. The reversal of 643566045 is 540665346.

643566045 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 643566045 - 2³ = 643566037 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 643565994 and 643566012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643566047) 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, 691542 + ... + 692471.

It is an arithmetic number, because the mean of its divisors is an integer number (66432672).

Almost surely, 2^643566045 is an apocalyptic number.

It is an amenable number.

643566045 is a deficient number, since it is larger than the sum of its proper divisors (419356707).

643566045 is a wasteful number, since it uses less digits than its factorization.

643566045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1384052.

The product of its (nonzero) digits is 259200, while the sum is 39.

The square root of 643566045 is about 25368.6035287715. The cubic root of 643566045 is about 863.3714980255.

The spelling of 643566045 in words is "six hundred forty-three million, five hundred sixty-six thousand, forty-five".