643017045 has 16 divisors (see below), whose sum is σ = 1122357312. Its totient is φ = 311765760.

The previous prime is 643017031. The next prime is 643017047. The reversal of 643017045 is 540710346.

643017045 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 643017045 - 2¹² = 643012949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643017047) 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, 1948372 + ... + 1948701.

It is an arithmetic number, because the mean of its divisors is an integer number (70147332).

Almost surely, 2^643017045 is an apocalyptic number.

It is an amenable number.

643017045 is a deficient number, since it is larger than the sum of its proper divisors (479340267).

643017045 is a wasteful number, since it uses less digits than its factorization.

643017045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3897092.

The product of its (nonzero) digits is 10080, while the sum is 30.

The square root of 643017045 is about 25357.7807585759. The cubic root of 643017045 is about 863.1259258210.

The spelling of 643017045 in words is "six hundred forty-three million, seventeen thousand, forty-five".