1266732617 has 2 divisors, whose sum is σ = 1266732618. Its totient is φ = 1266732616.

The previous prime is 1266732601. The next prime is 1266732647. The reversal of 1266732617 is 7162376621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1176558601 + 90174016 = 34301^2 + 9496^2 .

It is an emirp because it is prime and its reverse (7162376621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1266732617 - 2⁴ = 1266732601 is a prime.

It is a super-2 number, since 2×1266732617² = 3209223045943337378, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1266732647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 633366308 + 633366309.

It is an arithmetic number, because the mean of its divisors is an integer number (633366309).

Almost surely, 2^1266732617 is an apocalyptic number.

It is an amenable number.

1266732617 is a deficient number, since it is larger than the sum of its proper divisors (1).

1266732617 is an equidigital number, since it uses as much as digits as its factorization.

1266732617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 127008, while the sum is 41.

The square root of 1266732617 is about 35591.1873502416. The cubic root of 1266732617 is about 1082.0026334068.

The spelling of 1266732617 in words is "one billion, two hundred sixty-six million, seven hundred thirty-two thousand, six hundred seventeen".