505510953209 has 2 divisors, whose sum is σ = 505510953210. Its totient is φ = 505510953208.

The previous prime is 505510953193. The next prime is 505510953247. The reversal of 505510953209 is 902359015505.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 367754919184 + 137756034025 = 606428^2 + 371155^2 .

It is a cyclic number.

It is not a de Polignac number, because 505510953209 - 2⁴ = 505510953193 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 505510953209.

It is not a weakly prime, because it can be changed into another prime (505510953809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252755476604 + 252755476605.

It is an arithmetic number, because the mean of its divisors is an integer number (252755476605).

Almost surely, 2^505510953209 is an apocalyptic number.

It is an amenable number.

505510953209 is a deficient number, since it is larger than the sum of its proper divisors (1).

505510953209 is an equidigital number, since it uses as much as digits as its factorization.

505510953209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 303750, while the sum is 44.

The spelling of 505510953209 in words is "five hundred five billion, five hundred ten million, nine hundred fifty-three thousand, two hundred nine".