643076743 has 2 divisors, whose sum is σ = 643076744. Its totient is φ = 643076742.

The previous prime is 643076737. The next prime is 643076771. The reversal of 643076743 is 347670346.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 643076743 - 2¹³ = 643068551 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 643076696 and 643076705.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (643076713) 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 as a sum of consecutive naturals, namely, 321538371 + 321538372.

It is an arithmetic number, because the mean of its divisors is an integer number (321538372).

Almost surely, 2^643076743 is an apocalyptic number.

643076743 is a deficient number, since it is larger than the sum of its proper divisors (1).

643076743 is an equidigital number, since it uses as much as digits as its factorization.

643076743 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 254016, while the sum is 40.

The square root of 643076743 is about 25358.9578453059. The cubic root of 643076743 is about 863.1526359979.

The spelling of 643076743 in words is "six hundred forty-three million, seventy-six thousand, seven hundred forty-three".