138256968853 has 2 divisors, whose sum is σ = 138256968854. Its totient is φ = 138256968852.

The previous prime is 138256968803. The next prime is 138256968947. The reversal of 138256968853 is 358869652831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 97008577444 + 41248391409 = 311462^2 + 203097^2 .

It is a cyclic number.

It is not a de Polignac number, because 138256968853 - 2⁹ = 138256968341 is a prime.

It is a super-2 number, since 2×138256968853² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138256968803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69128484426 + 69128484427.

It is an arithmetic number, because the mean of its divisors is an integer number (69128484427).

Almost surely, 2^138256968853 is an apocalyptic number.

It is an amenable number.

138256968853 is a deficient number, since it is larger than the sum of its proper divisors (1).

138256968853 is an equidigital number, since it uses as much as digits as its factorization.

138256968853 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 74649600, while the sum is 64.

The spelling of 138256968853 in words is "one hundred thirty-eight billion, two hundred fifty-six million, nine hundred sixty-eight thousand, eight hundred fifty-three".