1266120017 has 2 divisors, whose sum is σ = 1266120018. Its totient is φ = 1266120016.

The previous prime is 1266119989. The next prime is 1266120029. The reversal of 1266120017 is 7100216621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 707081281 + 559038736 = 26591^2 + 23644^2 .

It is a cyclic number.

It is not a de Polignac number, because 1266120017 - 2¹⁴ = 1266103633 is a prime.

It is not a weakly prime, because it can be changed into another prime (1266120047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 633060008 + 633060009.

It is an arithmetic number, because the mean of its divisors is an integer number (633060009).

Almost surely, 2^1266120017 is an apocalyptic number.

It is an amenable number.

1266120017 is a deficient number, since it is larger than the sum of its proper divisors (1).

1266120017 is an equidigital number, since it uses as much as digits as its factorization.

1266120017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 1266120017 is about 35582.5802465195. The cubic root of 1266120017 is about 1081.8281841496.

Adding to 1266120017 its reverse (7100216621), we get a palindrome (8366336638).

The spelling of 1266120017 in words is "one billion, two hundred sixty-six million, one hundred twenty thousand, seventeen".