205169137949 has 2 divisors, whose sum is σ = 205169137950. Its totient is φ = 205169137948.

The previous prime is 205169137931. The next prime is 205169137973. The reversal of 205169137949 is 949731961502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 195812445049 + 9356692900 = 442507^2 + 96730^2 .

It is a cyclic number.

It is not a de Polignac number, because 205169137949 - 2²⁸ = 204900702493 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 205169137894 and 205169137903.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205169139949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102584568974 + 102584568975.

It is an arithmetic number, because the mean of its divisors is an integer number (102584568975).

Almost surely, 2^205169137949 is an apocalyptic number.

It is an amenable number.

205169137949 is a deficient number, since it is larger than the sum of its proper divisors (1).

205169137949 is an equidigital number, since it uses as much as digits as its factorization.

205169137949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3674160, while the sum is 56.

The spelling of 205169137949 in words is "two hundred five billion, one hundred sixty-nine million, one hundred thirty-seven thousand, nine hundred forty-nine".