642440463139 has 2 divisors, whose sum is σ = 642440463140. Its totient is φ = 642440463138.

The previous prime is 642440463113. The next prime is 642440463167. The reversal of 642440463139 is 931364044246.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 642440463139 - 2⁷ = 642440463011 is a prime.

It is not a weakly prime, because it can be changed into another prime (642440461139) 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, 321220231569 + 321220231570.

It is an arithmetic number, because the mean of its divisors is an integer number (321220231570).

Almost surely, 2^642440463139 is an apocalyptic number.

642440463139 is a deficient number, since it is larger than the sum of its proper divisors (1).

642440463139 is an equidigital number, since it uses as much as digits as its factorization.

642440463139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1492992, while the sum is 46.

The spelling of 642440463139 in words is "six hundred forty-two billion, four hundred forty million, four hundred sixty-three thousand, one hundred thirty-nine".