638841144107 has 2 divisors, whose sum is σ = 638841144108. Its totient is φ = 638841144106.

The previous prime is 638841144037. The next prime is 638841144157. The reversal of 638841144107 is 701441148836.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 638841144107 - 2⁸ = 638841143851 is a prime.

It is not a weakly prime, because it can be changed into another prime (638841144157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319420572053 + 319420572054.

It is an arithmetic number, because the mean of its divisors is an integer number (319420572054).

Almost surely, 2^638841144107 is an apocalyptic number.

638841144107 is a deficient number, since it is larger than the sum of its proper divisors (1).

638841144107 is an equidigital number, since it uses as much as digits as its factorization.

638841144107 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 516096, while the sum is 47.

The spelling of 638841144107 in words is "six hundred thirty-eight billion, eight hundred forty-one million, one hundred forty-four thousand, one hundred seven".