643500023 has 2 divisors, whose sum is σ = 643500024. Its totient is φ = 643500022.

The previous prime is 643500017. The next prime is 643500029. The reversal of 643500023 is 320005346.

It is a balanced prime because it is at equal distance from previous prime (643500017) and next prime (643500029).

It is a cyclic number.

It is not a de Polignac number, because 643500023 - 2⁴ = 643500007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (643500029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321750011 + 321750012.

It is an arithmetic number, because the mean of its divisors is an integer number (321750012).

Almost surely, 2^643500023 is an apocalyptic number.

643500023 is a deficient number, since it is larger than the sum of its proper divisors (1).

643500023 is an equidigital number, since it uses as much as digits as its factorization.

643500023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 23.

The square root of 643500023 is about 25367.3022412711. The cubic root of 643500023 is about 863.3419732327.

Adding to 643500023 its reverse (320005346), we get a palindrome (963505369).

The spelling of 643500023 in words is "six hundred forty-three million, five hundred thousand, twenty-three".