2180685593917 has 2 divisors, whose sum is σ = 2180685593918. Its totient is φ = 2180685593916.

The previous prime is 2180685593899. The next prime is 2180685594037. The reversal of 2180685593917 is 7193955860812.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1838014678756 + 342670915161 = 1355734^2 + 585381^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2180685593917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2180685593417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1090342796958 + 1090342796959.

It is an arithmetic number, because the mean of its divisors is an integer number (1090342796959).

Almost surely, 2^{2180685593917} is an apocalyptic number.

It is an amenable number.

2180685593917 is a deficient number, since it is larger than the sum of its proper divisors (1).

2180685593917 is an equidigital number, since it uses as much as digits as its factorization.

2180685593917 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32659200, while the sum is 64.

The spelling of 2180685593917 in words is "two trillion, one hundred eighty billion, six hundred eighty-five million, five hundred ninety-three thousand, nine hundred seventeen".