1686031175681 has 2 divisors, whose sum is σ = 1686031175682. Its totient is φ = 1686031175680.

The previous prime is 1686031175659. The next prime is 1686031175707. The reversal of 1686031175681 is 1865711306861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1426135135681 + 259896040000 = 1194209^2 + 509800^2 .

It is a cyclic number.

It is not a de Polignac number, because 1686031175681 - 2²² = 1686026981377 is a prime.

It is a super-2 number, since 2×1686031175681² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1686031172681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 843015587840 + 843015587841.

It is an arithmetic number, because the mean of its divisors is an integer number (843015587841).

Almost surely, 2^{1686031175681} is an apocalyptic number.

It is an amenable number.

1686031175681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1686031175681 is an equidigital number, since it uses as much as digits as its factorization.

1686031175681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1451520, while the sum is 53.

The spelling of 1686031175681 in words is "one trillion, six hundred eighty-six billion, thirty-one million, one hundred seventy-five thousand, six hundred eighty-one".