638841144037 has 2 divisors, whose sum is σ = 638841144038. Its totient is φ = 638841144036.

The previous prime is 638841144001. The next prime is 638841144107. The reversal of 638841144037 is 730441148836.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 638415382081 + 425761956 = 799009^2 + 20634^2 .

It is a cyclic number.

It is not a de Polignac number, because 638841144037 - 2¹¹ = 638841141989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (638841144737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319420572018 + 319420572019.

It is an arithmetic number, because the mean of its divisors is an integer number (319420572019).

Almost surely, 2^638841144037 is an apocalyptic number.

It is an amenable number.

638841144037 is a deficient number, since it is larger than the sum of its proper divisors (1).

638841144037 is an equidigital number, since it uses as much as digits as its factorization.

638841144037 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1548288, while the sum is 49.

The spelling of 638841144037 in words is "six hundred thirty-eight billion, eight hundred forty-one million, one hundred forty-four thousand, thirty-seven".