1266146261 has 2 divisors, whose sum is σ = 1266146262. Its totient is φ = 1266146260.

The previous prime is 1266146209. The next prime is 1266146291. The reversal of 1266146261 is 1626416621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 862538161 + 403608100 = 29369^2 + 20090^2 .

It is a cyclic number.

It is not a de Polignac number, because 1266146261 - 2¹⁴ = 1266129877 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1266146291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 633073130 + 633073131.

It is an arithmetic number, because the mean of its divisors is an integer number (633073131).

Almost surely, 2^1266146261 is an apocalyptic number.

It is an amenable number.

1266146261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1266146261 is an equidigital number, since it uses as much as digits as its factorization.

1266146261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 35.

The square root of 1266146261 is about 35582.9490205632. The cubic root of 1266146261 is about 1081.8356587708.

The spelling of 1266146261 in words is "one billion, two hundred sixty-six million, one hundred forty-six thousand, two hundred sixty-one".