642144781139 has 2 divisors, whose sum is σ = 642144781140. Its totient is φ = 642144781138.

The previous prime is 642144781133. The next prime is 642144781171. The reversal of 642144781139 is 931187441246.

642144781139 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 642144781139 - 2⁸ = 642144780883 is a prime.

It is not a weakly prime, because it can be changed into another prime (642144781133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321072390569 + 321072390570.

It is an arithmetic number, because the mean of its divisors is an integer number (321072390570).

Almost surely, 2^642144781139 is an apocalyptic number.

642144781139 is a deficient number, since it is larger than the sum of its proper divisors (1).

642144781139 is an equidigital number, since it uses as much as digits as its factorization.

642144781139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1161216, while the sum is 50.

The spelling of 642144781139 in words is "six hundred forty-two billion, one hundred forty-four million, seven hundred eighty-one thousand, one hundred thirty-nine".