642330533993 has 2 divisors, whose sum is σ = 642330533994. Its totient is φ = 642330533992.

The previous prime is 642330533951. The next prime is 642330534119. The reversal of 642330533993 is 399335033246.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 403025634649 + 239304899344 = 634843^2 + 489188^2 .

It is a cyclic number.

It is not a de Polignac number, because 642330533993 - 2¹⁶ = 642330468457 is a prime.

It is not a weakly prime, because it can be changed into another prime (642330533903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321165266996 + 321165266997.

It is an arithmetic number, because the mean of its divisors is an integer number (321165266997).

Almost surely, 2^642330533993 is an apocalyptic number.

It is an amenable number.

642330533993 is a deficient number, since it is larger than the sum of its proper divisors (1).

642330533993 is an equidigital number, since it uses as much as digits as its factorization.

642330533993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4723920, while the sum is 50.

The spelling of 642330533993 in words is "six hundred forty-two billion, three hundred thirty million, five hundred thirty-three thousand, nine hundred ninety-three".