1688885431361 has 2 divisors, whose sum is σ = 1688885431362. Its totient is φ = 1688885431360.

The previous prime is 1688885431333. The next prime is 1688885431369. The reversal of 1688885431361 is 1631345888861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1072817421361 + 616068010000 = 1035769^2 + 784900^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1688885431361 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1688885431294 and 1688885431303.

It is not a weakly prime, because it can be changed into another prime (1688885431369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 844442715680 + 844442715681.

It is an arithmetic number, because the mean of its divisors is an integer number (844442715681).

Almost surely, 2^{1688885431361} is an apocalyptic number.

It is an amenable number.

1688885431361 is a deficient number, since it is larger than the sum of its proper divisors (1).

1688885431361 is an equidigital number, since it uses as much as digits as its factorization.

1688885431361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26542080, while the sum is 62.

The spelling of 1688885431361 in words is "one trillion, six hundred eighty-eight billion, eight hundred eighty-five million, four hundred thirty-one thousand, three hundred sixty-one".