2168127751381 has 2 divisors, whose sum is σ = 2168127751382. Its totient is φ = 2168127751380.

The previous prime is 2168127751357. The next prime is 2168127751397. The reversal of 2168127751381 is 1831577218612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1314473715025 + 853654036356 = 1146505^2 + 923934^2 .

It is a cyclic number.

It is not a de Polignac number, because 2168127751381 - 2³¹ = 2165980267733 is a prime.

It is a super-2 number, since 2×2168127751381² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2168127851381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1084063875690 + 1084063875691.

It is an arithmetic number, because the mean of its divisors is an integer number (1084063875691).

Almost surely, 2^{2168127751381} is an apocalyptic number.

It is an amenable number.

2168127751381 is a deficient number, since it is larger than the sum of its proper divisors (1).

2168127751381 is an equidigital number, since it uses as much as digits as its factorization.

2168127751381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1128960, while the sum is 52.

The spelling of 2168127751381 in words is "two trillion, one hundred sixty-eight billion, one hundred twenty-seven million, seven hundred fifty-one thousand, three hundred eighty-one".