638841144001 has 2 divisors, whose sum is σ = 638841144002. Its totient is φ = 638841144000.

The previous prime is 638841143989. The next prime is 638841144037. The reversal of 638841144001 is 100441148836.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 333252198400 + 305588945601 = 577280^2 + 552801^2 .

It is a cyclic number.

It is not a de Polignac number, because 638841144001 - 2⁹ = 638841143489 is a prime.

It is not a weakly prime, because it can be changed into another prime (638841124001) 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, 319420572000 + 319420572001.

It is an arithmetic number, because the mean of its divisors is an integer number (319420572001).

Almost surely, 2^638841144001 is an apocalyptic number.

It is an amenable number.

638841144001 is a deficient number, since it is larger than the sum of its proper divisors (1).

638841144001 is an equidigital number, since it uses as much as digits as its factorization.

638841144001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 73728, while the sum is 40.

The spelling of 638841144001 in words is "six hundred thirty-eight billion, eight hundred forty-one million, one hundred forty-four thousand, one".