643543023 has 16 divisors (see below), whose sum is σ = 869353056. Its totient is φ = 423413760.

The previous prime is 643543003. The next prime is 643543039. The reversal of 643543023 is 320345346.

It is not a de Polignac number, because 643543023 - 2⁶ = 643542959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643543003) 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, 77761 + ... + 85637.

It is an arithmetic number, because the mean of its divisors is an integer number (54334566).

Almost surely, 2^643543023 is an apocalyptic number.

643543023 is a deficient number, since it is larger than the sum of its proper divisors (225810033).

643543023 is a wasteful number, since it uses less digits than its factorization.

643543023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8234.

The product of its (nonzero) digits is 25920, while the sum is 30.

The square root of 643543023 is about 25368.1497748653. The cubic root of 643543023 is about 863.3612029020.

Adding to 643543023 its reverse (320345346), we get a palindrome (963888369).

The spelling of 643543023 in words is "six hundred forty-three million, five hundred forty-three thousand, twenty-three".