1266866539 has 2 divisors, whose sum is σ = 1266866540. Its totient is φ = 1266866538.

The previous prime is 1266866423. The next prime is 1266866543. The reversal of 1266866539 is 9356686621.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1266866539 - 2¹¹ = 1266864491 is a prime.

It is not a weakly prime, because it can be changed into another prime (1266863539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 633433269 + 633433270.

It is an arithmetic number, because the mean of its divisors is an integer number (633433270).

Almost surely, 2^1266866539 is an apocalyptic number.

1266866539 is a deficient number, since it is larger than the sum of its proper divisors (1).

1266866539 is an equidigital number, since it uses as much as digits as its factorization.

1266866539 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2799360, while the sum is 52.

The square root of 1266866539 is about 35593.0686932161. The cubic root of 1266866539 is about 1082.0407626980.

It can be divided in two parts, 126686 and 6539, that added together give a square (133225 = 365²).

The spelling of 1266866539 in words is "one billion, two hundred sixty-six million, eight hundred sixty-six thousand, five hundred thirty-nine".