638039288129 has 2 divisors, whose sum is σ = 638039288130. Its totient is φ = 638039288128.

The previous prime is 638039288101. The next prime is 638039288153. The reversal of 638039288129 is 921882930836.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 575546787904 + 62492500225 = 758648^2 + 249985^2 .

It is a cyclic number.

It is not a de Polignac number, because 638039288129 - 2¹² = 638039284033 is a prime.

It is a super-2 number, since 2×638039288129² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (638039288429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319019644064 + 319019644065.

It is an arithmetic number, because the mean of its divisors is an integer number (319019644065).

Almost surely, 2^638039288129 is an apocalyptic number.

It is an amenable number.

638039288129 is a deficient number, since it is larger than the sum of its proper divisors (1).

638039288129 is an equidigital number, since it uses as much as digits as its factorization.

638039288129 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8957952, while the sum is 59.

The spelling of 638039288129 in words is "six hundred thirty-eight billion, thirty-nine million, two hundred eighty-eight thousand, one hundred twenty-nine".