1266122412173 has 2 divisors, whose sum is σ = 1266122412174. Its totient is φ = 1266122412172.

The previous prime is 1266122411927. The next prime is 1266122412193. The reversal of 1266122412173 is 3712142216621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1160732581129 + 105389831044 = 1077373^2 + 324638^2 .

It is a cyclic number.

It is not a de Polignac number, because 1266122412173 - 2²² = 1266118217869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1266122412193) 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, 633061206086 + 633061206087.

It is an arithmetic number, because the mean of its divisors is an integer number (633061206087).

Almost surely, 2^{1266122412173} is an apocalyptic number.

It is an amenable number.

1266122412173 is a deficient number, since it is larger than the sum of its proper divisors (1).

1266122412173 is an equidigital number, since it uses as much as digits as its factorization.

1266122412173 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 38.

Adding to 1266122412173 its reverse (3712142216621), we get a palindrome (4978264628794).

The spelling of 1266122412173 in words is "one trillion, two hundred sixty-six billion, one hundred twenty-two million, four hundred twelve thousand, one hundred seventy-three".