2185196730869 has 2 divisors, whose sum is σ = 2185196730870. Its totient is φ = 2185196730868.

The previous prime is 2185196730863. The next prime is 2185196730923. The reversal of 2185196730869 is 9680376915812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1765470264100 + 419726466769 = 1328710^2 + 647863^2 .

It is a cyclic number.

It is not a de Polignac number, because 2185196730869 - 2⁴⁰ = 1085685103093 is a prime.

It is a super-2 number, since 2×2185196730869² (a number of 25 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2185196730863) 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, 1092598365434 + 1092598365435.

It is an arithmetic number, because the mean of its divisors is an integer number (1092598365435).

Almost surely, 2^{2185196730869} is an apocalyptic number.

It is an amenable number.

2185196730869 is a deficient number, since it is larger than the sum of its proper divisors (1).

2185196730869 is an equidigital number, since it uses as much as digits as its factorization.

2185196730869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 39191040, while the sum is 65.

The spelling of 2185196730869 in words is "two trillion, one hundred eighty-five billion, one hundred ninety-six million, seven hundred thirty thousand, eight hundred sixty-nine".