1266323506121 has 2 divisors, whose sum is σ = 1266323506122. Its totient is φ = 1266323506120.

The previous prime is 1266323506061. The next prime is 1266323506141. The reversal of 1266323506121 is 1216053236621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1242433476025 + 23890030096 = 1114645^2 + 154564^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1266323506121 is a prime.

It is not a weakly prime, because it can be changed into another prime (1266323506141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 633161753060 + 633161753061.

It is an arithmetic number, because the mean of its divisors is an integer number (633161753061).

Almost surely, 2^{1266323506121} is an apocalyptic number.

It is an amenable number.

1266323506121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1266323506121 is an equidigital number, since it uses as much as digits as its factorization.

1266323506121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 77760, while the sum is 38.

The spelling of 1266323506121 in words is "one trillion, two hundred sixty-six billion, three hundred twenty-three million, five hundred six thousand, one hundred twenty-one".