643323007 has 2 divisors, whose sum is σ = 643323008. Its totient is φ = 643323006.

The previous prime is 643322987. The next prime is 643323047. The reversal of 643323007 is 700323346.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 643323007 - 2¹⁹ = 642798719 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (643323047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321661503 + 321661504.

It is an arithmetic number, because the mean of its divisors is an integer number (321661504).

Almost surely, 2^643323007 is an apocalyptic number.

643323007 is a deficient number, since it is larger than the sum of its proper divisors (1).

643323007 is an equidigital number, since it uses as much as digits as its factorization.

643323007 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 28.

The square root of 643323007 is about 25363.8129428523. The cubic root of 643323007 is about 863.2628023689.

The spelling of 643323007 in words is "six hundred forty-three million, three hundred twenty-three thousand, seven".