2039168110781 has 2 divisors, whose sum is σ = 2039168110782. Its totient is φ = 2039168110780.

The previous prime is 2039168110751. The next prime is 2039168110783. The reversal of 2039168110781 is 1870118619302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1829824344100 + 209343766681 = 1352710^2 + 457541^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2039168110781 is a prime.

It is a super-2 number, since 2×2039168110781² (a number of 25 digits) contains 22 as substring.

Together with 2039168110783, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2039168110783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1019584055390 + 1019584055391.

It is an arithmetic number, because the mean of its divisors is an integer number (1019584055391).

Almost surely, 2^{2039168110781} is an apocalyptic number.

It is an amenable number.

2039168110781 is a deficient number, since it is larger than the sum of its proper divisors (1).

2039168110781 is an equidigital number, since it uses as much as digits as its factorization.

2039168110781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 47.

The spelling of 2039168110781 in words is "two trillion, thirty-nine billion, one hundred sixty-eight million, one hundred ten thousand, seven hundred eighty-one".