643068297 has 6 divisors (see below), whose sum is σ = 928876442. Its totient is φ = 428712192.

The previous prime is 643068289. The next prime is 643068323. The reversal of 643068297 is 792860346.

It can be written as a sum of positive squares in only one way, i.e., 441882441 + 201185856 = 21021^2 + 14184^2 .

It is not a de Polignac number, because 643068297 - 2³ = 643068289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (643068697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35726008 + ... + 35726025.

Almost surely, 2^643068297 is an apocalyptic number.

It is an amenable number.

643068297 is a deficient number, since it is larger than the sum of its proper divisors (285808145).

643068297 is a wasteful number, since it uses less digits than its factorization.

643068297 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71452039 (or 71452036 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 45.

The square root of 643068297 is about 25358.7913158336. The cubic root of 643068297 is about 863.1488571752.

The spelling of 643068297 in words is "six hundred forty-three million, sixty-eight thousand, two hundred ninety-seven".