138168108802253 has 2 divisors, whose sum is σ = 138168108802254. Its totient is φ = 138168108802252.

The previous prime is 138168108802237. The next prime is 138168108802267. The reversal of 138168108802253 is 352208801861831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 127840967395684 + 10327141406569 = 11306678^2 + 3213587^2 .

It is a cyclic number.

It is not a de Polignac number, because 138168108802253 - 2⁴ = 138168108802237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138168108802753) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69084054401126 + 69084054401127.

It is an arithmetic number, because the mean of its divisors is an integer number (69084054401127).

Almost surely, 2^{138168108802253} is an apocalyptic number.

It is an amenable number.

138168108802253 is a deficient number, since it is larger than the sum of its proper divisors (1).

138168108802253 is an equidigital number, since it uses as much as digits as its factorization.

138168108802253 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4423680, while the sum is 56.

The spelling of 138168108802253 in words is "one hundred thirty-eight trillion, one hundred sixty-eight billion, one hundred eight million, eight hundred two thousand, two hundred fifty-three".