2180685593897 has 2 divisors, whose sum is σ = 2180685593898. Its totient is φ = 2180685593896.

The previous prime is 2180685593851. The next prime is 2180685593899. The reversal of 2180685593897 is 7983955860812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1938251468521 + 242434125376 = 1392211^2 + 492376^2 .

It is a cyclic number.

It is not a de Polignac number, because 2180685593897 - 2¹⁶ = 2180685528361 is a prime.

Together with 2180685593899, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2180685593897.

It is not a weakly prime, because it can be changed into another prime (2180685593899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1090342796948 + 1090342796949.

It is an arithmetic number, because the mean of its divisors is an integer number (1090342796949).

Almost surely, 2^{2180685593897} is an apocalyptic number.

It is an amenable number.

2180685593897 is a deficient number, since it is larger than the sum of its proper divisors (1).

2180685593897 is an equidigital number, since it uses as much as digits as its factorization.

2180685593897 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 261273600, while the sum is 71.

The spelling of 2180685593897 in words is "two trillion, one hundred eighty billion, six hundred eighty-five million, five hundred ninety-three thousand, eight hundred ninety-seven".