2180685561269 has 2 divisors, whose sum is σ = 2180685561270. Its totient is φ = 2180685561268.

The previous prime is 2180685561239. The next prime is 2180685561281. The reversal of 2180685561269 is 9621655860812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2078966027044 + 101719534225 = 1441862^2 + 318935^2 .

It is a cyclic number.

It is not a de Polignac number, because 2180685561269 - 2¹² = 2180685557173 is a prime.

It is a super-2 number, since 2×2180685561269² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2180685561239) 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, 1090342780634 + 1090342780635.

It is an arithmetic number, because the mean of its divisors is an integer number (1090342780635).

Almost surely, 2^{2180685561269} is an apocalyptic number.

It is an amenable number.

2180685561269 is a deficient number, since it is larger than the sum of its proper divisors (1).

2180685561269 is an equidigital number, since it uses as much as digits as its factorization.

2180685561269 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12441600, while the sum is 59.

The spelling of 2180685561269 in words is "two trillion, one hundred eighty billion, six hundred eighty-five million, five hundred sixty-one thousand, two hundred sixty-nine".