205606156849 has 2 divisors, whose sum is σ = 205606156850. Its totient is φ = 205606156848.

The previous prime is 205606156841. The next prime is 205606156871. The reversal of 205606156849 is 948651606502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 167111716849 + 38494440000 = 408793^2 + 196200^2 .

It is a cyclic number.

It is not a de Polignac number, because 205606156849 - 2³ = 205606156841 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 205606156796 and 205606156805.

It is not a weakly prime, because it can be changed into another prime (205606156841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102803078424 + 102803078425.

It is an arithmetic number, because the mean of its divisors is an integer number (102803078425).

Almost surely, 2^205606156849 is an apocalyptic number.

It is an amenable number.

205606156849 is a deficient number, since it is larger than the sum of its proper divisors (1).

205606156849 is an equidigital number, since it uses as much as digits as its factorization.

205606156849 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3110400, while the sum is 52.

The spelling of 205606156849 in words is "two hundred five billion, six hundred six million, one hundred fifty-six thousand, eight hundred forty-nine".