205213687169 has 2 divisors, whose sum is σ = 205213687170. Its totient is φ = 205213687168.

The previous prime is 205213687141. The next prime is 205213687183. The reversal of 205213687169 is 961786312502.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 159508378225 + 45705308944 = 399385^2 + 213788^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205213687169 is a prime.

It is a super-2 number, since 2×205213687169² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (205213687199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102606843584 + 102606843585.

It is an arithmetic number, because the mean of its divisors is an integer number (102606843585).

Almost surely, 2^205213687169 is an apocalyptic number.

It is an amenable number.

205213687169 is a deficient number, since it is larger than the sum of its proper divisors (1).

205213687169 is an equidigital number, since it uses as much as digits as its factorization.

205213687169 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1088640, while the sum is 50.

The spelling of 205213687169 in words is "two hundred five billion, two hundred thirteen million, six hundred eighty-seven thousand, one hundred sixty-nine".