643323502007 has 2 divisors, whose sum is σ = 643323502008. Its totient is φ = 643323502006.

The previous prime is 643323501973. The next prime is 643323502021. The reversal of 643323502007 is 700205323346.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 643323502007 - 2¹⁶ = 643323436471 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (643323502037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321661751003 + 321661751004.

It is an arithmetic number, because the mean of its divisors is an integer number (321661751004).

Almost surely, 2^643323502007 is an apocalyptic number.

643323502007 is a deficient number, since it is larger than the sum of its proper divisors (1).

643323502007 is an equidigital number, since it uses as much as digits as its factorization.

643323502007 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90720, while the sum is 35.

The spelling of 643323502007 in words is "six hundred forty-three billion, three hundred twenty-three million, five hundred two thousand, seven".