205161499349 has 2 divisors, whose sum is σ = 205161499350. Its totient is φ = 205161499348.

The previous prime is 205161499307. The next prime is 205161499363. The reversal of 205161499349 is 943994161502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 180612250225 + 24549249124 = 424985^2 + 156682^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205161499349 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 205161499349.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205161499399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102580749674 + 102580749675.

It is an arithmetic number, because the mean of its divisors is an integer number (102580749675).

Almost surely, 2^205161499349 is an apocalyptic number.

It is an amenable number.

205161499349 is a deficient number, since it is larger than the sum of its proper divisors (1).

205161499349 is an equidigital number, since it uses as much as digits as its factorization.

205161499349 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2099520, while the sum is 53.

The spelling of 205161499349 in words is "two hundred five billion, one hundred sixty-one million, four hundred ninety-nine thousand, three hundred forty-nine".