505555412129 has 2 divisors, whose sum is σ = 505555412130. Its totient is φ = 505555412128.

The previous prime is 505555412099. The next prime is 505555412209. The reversal of 505555412129 is 921214555505.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 456100323904 + 49455088225 = 675352^2 + 222385^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-505555412129 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 505555412129.

It is not a weakly prime, because it can be changed into another prime (505555412429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252777706064 + 252777706065.

It is an arithmetic number, because the mean of its divisors is an integer number (252777706065).

Almost surely, 2^505555412129 is an apocalyptic number.

It is an amenable number.

505555412129 is a deficient number, since it is larger than the sum of its proper divisors (1).

505555412129 is an equidigital number, since it uses as much as digits as its factorization.

505555412129 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 450000, while the sum is 44.

The spelling of 505555412129 in words is "five hundred five billion, five hundred fifty-five million, four hundred twelve thousand, one hundred twenty-nine".