1688494122797 has 2 divisors, whose sum is σ = 1688494122798. Its totient is φ = 1688494122796.

The previous prime is 1688494122793. The next prime is 1688494122823. The reversal of 1688494122797 is 7972214948861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1190501392201 + 497992730596 = 1091101^2 + 705686^2 .

It is a cyclic number.

It is not a de Polignac number, because 1688494122797 - 2² = 1688494122793 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1688494122793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 844247061398 + 844247061399.

It is an arithmetic number, because the mean of its divisors is an integer number (844247061399).

Almost surely, 2^{1688494122797} is an apocalyptic number.

It is an amenable number.

1688494122797 is a deficient number, since it is larger than the sum of its proper divisors (1).

1688494122797 is an equidigital number, since it uses as much as digits as its factorization.

1688494122797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 97542144, while the sum is 68.

The spelling of 1688494122797 in words is "one trillion, six hundred eighty-eight billion, four hundred ninety-four million, one hundred twenty-two thousand, seven hundred ninety-seven".