1266530011 has 4 divisors (see below), whose sum is σ = 1285433512. Its totient is φ = 1247626512.

The previous prime is 1266529997. The next prime is 1266530033. The reversal of 1266530011 is 1100356621.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1266530011 - 2¹¹ = 1266527963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1266530051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9451650 + ... + 9451783.

It is an arithmetic number, because the mean of its divisors is an integer number (321358378).

Almost surely, 2^1266530011 is an apocalyptic number.

1266530011 is a deficient number, since it is larger than the sum of its proper divisors (18903501).

1266530011 is an equidigital number, since it uses as much as digits as its factorization.

1266530011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18903500.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 1266530011 is about 35588.3409419433. The cubic root of 1266530011 is about 1081.9449438014.

Adding to 1266530011 its reverse (1100356621), we get a palindrome (2366886632).

The spelling of 1266530011 in words is "one billion, two hundred sixty-six million, five hundred thirty thousand, eleven".