1680277659857 has 2 divisors, whose sum is σ = 1680277659858. Its totient is φ = 1680277659856.

The previous prime is 1680277659839. The next prime is 1680277659887. The reversal of 1680277659857 is 7589567720861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1071879219856 + 608398440001 = 1035316^2 + 779999^2 .

It is a cyclic number.

It is not a de Polignac number, because 1680277659857 - 2³⁰ = 1679203918033 is a prime.

It is not a weakly prime, because it can be changed into another prime (1680277659887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 840138829928 + 840138829929.

It is an arithmetic number, because the mean of its divisors is an integer number (840138829929).

Almost surely, 2^{1680277659857} is an apocalyptic number.

It is an amenable number.

1680277659857 is a deficient number, since it is larger than the sum of its proper divisors (1).

1680277659857 is an equidigital number, since it uses as much as digits as its factorization.

1680277659857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 355622400, while the sum is 71.

The spelling of 1680277659857 in words is "one trillion, six hundred eighty billion, two hundred seventy-seven million, six hundred fifty-nine thousand, eight hundred fifty-seven".