1205550505069 has 2 divisors, whose sum is σ = 1205550505070. Its totient is φ = 1205550505068.

The previous prime is 1205550505021. The next prime is 1205550505091. The reversal of 1205550505069 is 9605050555021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 727463997225 + 478086507844 = 852915^2 + 691438^2 .

It is a cyclic number.

It is not a de Polignac number, because 1205550505069 - 2²⁵ = 1205516950637 is a prime.

It is a super-2 number, since 2×1205550505069² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1205550505099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 602775252534 + 602775252535.

It is an arithmetic number, because the mean of its divisors is an integer number (602775252535).

Almost surely, 2^{1205550505069} is an apocalyptic number.

It is an amenable number.

1205550505069 is a deficient number, since it is larger than the sum of its proper divisors (1).

1205550505069 is an equidigital number, since it uses as much as digits as its factorization.

1205550505069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 337500, while the sum is 43.

The spelling of 1205550505069 in words is "one trillion, two hundred five billion, five hundred fifty million, five hundred five thousand, sixty-nine".