643351334569 has 2 divisors, whose sum is σ = 643351334570. Its totient is φ = 643351334568.

The previous prime is 643351334543. The next prime is 643351334573. The reversal of 643351334569 is 965433153346.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 641601000000 + 1750334569 = 801000^2 + 41837^2 .

It is a cyclic number.

It is not a de Polignac number, because 643351334569 - 2¹⁹ = 643350810281 is a prime.

It is a super-2 number, since 2×643351334569² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (643351334539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321675667284 + 321675667285.

It is an arithmetic number, because the mean of its divisors is an integer number (321675667285).

Almost surely, 2^643351334569 is an apocalyptic number.

It is an amenable number.

643351334569 is a deficient number, since it is larger than the sum of its proper divisors (1).

643351334569 is an equidigital number, since it uses as much as digits as its factorization.

643351334569 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10497600, while the sum is 52.

The spelling of 643351334569 in words is "six hundred forty-three billion, three hundred fifty-one million, three hundred thirty-four thousand, five hundred sixty-nine".