138168108802249 has 32 divisors (see below), whose sum is σ = 147755153700000. Its totient is φ = 128745176592384.

The previous prime is 138168108802237. The next prime is 138168108802253. The reversal of 138168108802249 is 942208801861831.

It is a happy number.

It can be written as a sum of positive squares in 16 ways, for example, as 25574108697225 + 112594000105024 = 5057085^2 + 10611032^2 .

It is a cyclic number.

It is not a de Polignac number, because 138168108802249 - 2²³ = 138168100413641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138168108802649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18800936427 + ... + 18800943775.

It is an arithmetic number, because the mean of its divisors is an integer number (4617348553125).

Almost surely, 2^{138168108802249} is an apocalyptic number.

It is an amenable number.

138168108802249 is a deficient number, since it is larger than the sum of its proper divisors (9587044897751).

138168108802249 is a wasteful number, since it uses less digits than its factorization.

138168108802249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14157.

The product of its (nonzero) digits is 10616832, while the sum is 61.

The spelling of 138168108802249 in words is "one hundred thirty-eight trillion, one hundred sixty-eight billion, one hundred eight million, eight hundred two thousand, two hundred forty-nine".