642755930771 has 2 divisors, whose sum is σ = 642755930772. Its totient is φ = 642755930770.

The previous prime is 642755930753. The next prime is 642755930779. The reversal of 642755930771 is 177039557246.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-642755930771 is a prime.

It is not a weakly prime, because it can be changed into another prime (642755930779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321377965385 + 321377965386.

It is an arithmetic number, because the mean of its divisors is an integer number (321377965386).

Almost surely, 2^642755930771 is an apocalyptic number.

642755930771 is a deficient number, since it is larger than the sum of its proper divisors (1).

642755930771 is an equidigital number, since it uses as much as digits as its factorization.

642755930771 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11113200, while the sum is 56.

The spelling of 642755930771 in words is "six hundred forty-two billion, seven hundred fifty-five million, nine hundred thirty thousand, seven hundred seventy-one".