642121123326359 has 2 divisors, whose sum is σ = 642121123326360. Its totient is φ = 642121123326358.

The previous prime is 642121123326329. The next prime is 642121123326491. The reversal of 642121123326359 is 953623321121246.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 642121123326359 - 2⁸ = 642121123326103 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642121123326329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321060561663179 + 321060561663180.

It is an arithmetic number, because the mean of its divisors is an integer number (321060561663180).

Almost surely, 2^{642121123326359} is an apocalyptic number.

642121123326359 is a deficient number, since it is larger than the sum of its proper divisors (1).

642121123326359 is an equidigital number, since it uses as much as digits as its factorization.

642121123326359 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2799360, while the sum is 50.

The spelling of 642121123326359 in words is "six hundred forty-two trillion, one hundred twenty-one billion, one hundred twenty-three million, three hundred twenty-six thousand, three hundred fifty-nine".