642773816743 has 2 divisors, whose sum is σ = 642773816744. Its totient is φ = 642773816742.

The previous prime is 642773816681. The next prime is 642773816749. The reversal of 642773816743 is 347618377246.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-642773816743 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642773816749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321386908371 + 321386908372.

It is an arithmetic number, because the mean of its divisors is an integer number (321386908372).

Almost surely, 2^642773816743 is an apocalyptic number.

642773816743 is a deficient number, since it is larger than the sum of its proper divisors (1).

642773816743 is an equidigital number, since it uses as much as digits as its factorization.

642773816743 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28449792, while the sum is 58.

The spelling of 642773816743 in words is "six hundred forty-two billion, seven hundred seventy-three million, eight hundred sixteen thousand, seven hundred forty-three".