642274106857 has 2 divisors, whose sum is σ = 642274106858. Its totient is φ = 642274106856.

The previous prime is 642274106813. The next prime is 642274106927. The reversal of 642274106857 is 758601472246.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 359323518096 + 282950588761 = 599436^2 + 531931^2 .

It is a cyclic number.

It is not a de Polignac number, because 642274106857 - 2¹⁹ = 642273582569 is a prime.

It is not a weakly prime, because it can be changed into another prime (642277106857) 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, 321137053428 + 321137053429.

It is an arithmetic number, because the mean of its divisors is an integer number (321137053429).

Almost surely, 2^642274106857 is an apocalyptic number.

It is an amenable number.

642274106857 is a deficient number, since it is larger than the sum of its proper divisors (1).

642274106857 is an equidigital number, since it uses as much as digits as its factorization.

642274106857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4515840, while the sum is 52.

The spelling of 642274106857 in words is "six hundred forty-two billion, two hundred seventy-four million, one hundred six thousand, eight hundred fifty-seven".