642218468189033 has 2 divisors, whose sum is σ = 642218468189034. Its totient is φ = 642218468189032.

The previous prime is 642218468189027. The next prime is 642218468189063. The reversal of 642218468189033 is 330981864812246.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 598101414156544 + 44117054032489 = 24456112^2 + 6642067^2 .

It is a cyclic number.

It is not a de Polignac number, because 642218468189033 - 2³⁴ = 642201288319849 is a prime.

It is not a weakly prime, because it can be changed into another prime (642218468189063) 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, 321109234094516 + 321109234094517.

It is an arithmetic number, because the mean of its divisors is an integer number (321109234094517).

Almost surely, 2^{642218468189033} is an apocalyptic number.

It is an amenable number.

642218468189033 is a deficient number, since it is larger than the sum of its proper divisors (1).

642218468189033 is an equidigital number, since it uses as much as digits as its factorization.

642218468189033 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 95551488, while the sum is 65.

The spelling of 642218468189033 in words is "six hundred forty-two trillion, two hundred eighteen billion, four hundred sixty-eight million, one hundred eighty-nine thousand, thirty-three".