1266666041 has 2 divisors, whose sum is σ = 1266666042. Its totient is φ = 1266666040.

The previous prime is 1266665993. The next prime is 1266666053. The reversal of 1266666041 is 1406666621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1226470441 + 40195600 = 35021^2 + 6340^2 .

It is a cyclic number.

It is not a de Polignac number, because 1266666041 - 2⁶ = 1266665977 is a prime.

It is a super-2 number, since 2×1266666041² = 3208885718845227362, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1266665986 and 1266666004.

It is not a weakly prime, because it can be changed into another prime (1266666941) 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, 633333020 + 633333021.

It is an arithmetic number, because the mean of its divisors is an integer number (633333021).

Almost surely, 2^1266666041 is an apocalyptic number.

It is an amenable number.

1266666041 is a deficient number, since it is larger than the sum of its proper divisors (1).

1266666041 is an equidigital number, since it uses as much as digits as its factorization.

1266666041 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62208, while the sum is 38.

The square root of 1266666041 is about 35590.2520502454. The cubic root of 1266666041 is about 1081.9836773755.

The spelling of 1266666041 in words is "one billion, two hundred sixty-six million, six hundred sixty-six thousand, forty-one".