1266121163 has 2 divisors, whose sum is σ = 1266121164. Its totient is φ = 1266121162.

The previous prime is 1266121159. The next prime is 1266121193. The reversal of 1266121163 is 3611216621.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (3611216621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1266121163 - 2² = 1266121159 is a prime.

It is not a weakly prime, because it can be changed into another prime (1266121133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 633060581 + 633060582.

It is an arithmetic number, because the mean of its divisors is an integer number (633060582).

Almost surely, 2^1266121163 is an apocalyptic number.

1266121163 is a deficient number, since it is larger than the sum of its proper divisors (1).

1266121163 is an equidigital number, since it uses as much as digits as its factorization.

1266121163 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 29.

The square root of 1266121163 is about 35582.5963499012. The cubic root of 1266121163 is about 1081.8285105469.

Adding to 1266121163 its reverse (3611216621), we get a palindrome (4877337784).

The spelling of 1266121163 in words is "one billion, two hundred sixty-six million, one hundred twenty-one thousand, one hundred sixty-three".