643060697 has 2 divisors, whose sum is σ = 643060698. Its totient is φ = 643060696.

The previous prime is 643060667. The next prime is 643060699. The reversal of 643060697 is 796060346.

It is a happy number.

643060697 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 634233856 + 8826841 = 25184^2 + 2971^2 .

It is a cyclic number.

It is not a de Polignac number, because 643060697 - 2¹⁶ = 642995161 is a prime.

It is a super-2 number, since 2×643060697² = 827054120052251618, which contains 22 as substring.

Together with 643060699, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (643060699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321530348 + 321530349.

It is an arithmetic number, because the mean of its divisors is an integer number (321530349).

Almost surely, 2^643060697 is an apocalyptic number.

It is an amenable number.

643060697 is a deficient number, since it is larger than the sum of its proper divisors (1).

643060697 is an equidigital number, since it uses as much as digits as its factorization.

643060697 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 163296, while the sum is 41.

The square root of 643060697 is about 25358.6414659776. The cubic root of 643060697 is about 863.1454568328.

The spelling of 643060697 in words is "six hundred forty-three million, sixty thousand, six hundred ninety-seven".