505255778569 has 2 divisors, whose sum is σ = 505255778570. Its totient is φ = 505255778568.

The previous prime is 505255778563. The next prime is 505255778611. The reversal of 505255778569 is 965877552505.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 396537202944 + 108718575625 = 629712^2 + 329725^2 .

It is a cyclic number.

It is not a de Polignac number, because 505255778569 - 2²⁷ = 505121560841 is a prime.

It is a super-2 number, since 2×505255778569² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 505255778569.

It is not a weakly prime, because it can be changed into another prime (505255778563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252627889284 + 252627889285.

It is an arithmetic number, because the mean of its divisors is an integer number (252627889285).

Almost surely, 2^505255778569 is an apocalyptic number.

It is an amenable number.

505255778569 is a deficient number, since it is larger than the sum of its proper divisors (1).

505255778569 is an equidigital number, since it uses as much as digits as its factorization.

505255778569 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 132300000, while the sum is 64.

The spelling of 505255778569 in words is "five hundred five billion, two hundred fifty-five million, seven hundred seventy-eight thousand, five hundred sixty-nine".