1266263065 has 16 divisors (see below), whose sum is σ = 1560157200. Its totient is φ = 986030080.

The previous prime is 1266263039. The next prime is 1266263087. The reversal of 1266263065 is 5603626621.

It can be written as a sum of positive squares in 8 ways, for example, as 388444681 + 877818384 = 19709^2 + 29628^2 .

It is not a de Polignac number, because 1266263065 - 2⁷ = 1266262937 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85167 + ... + 98923.

It is an arithmetic number, because the mean of its divisors is an integer number (97509825).

Almost surely, 2^1266263065 is an apocalyptic number.

It is an amenable number.

1266263065 is a deficient number, since it is larger than the sum of its proper divisors (293894135).

1266263065 is a wasteful number, since it uses less digits than its factorization.

1266263065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14252.

The product of its (nonzero) digits is 77760, while the sum is 37.

The square root of 1266263065 is about 35584.5902744432. The cubic root of 1266263065 is about 1081.8689247661.

Adding to 1266263065 its reverse (5603626621), we get a palindrome (6869889686).

The spelling of 1266263065 in words is "one billion, two hundred sixty-six million, two hundred sixty-three thousand, sixty-five".