1263561266 has 16 divisors (see below), whose sum is σ = 2069863200. Its totient is φ = 573730080.

The previous prime is 1263561263. The next prime is 1263561311. The reversal of 1263561266 is 6621653621.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1263561263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9491 + ... + 51158.

It is an arithmetic number, because the mean of its divisors is an integer number (129366450).

Almost surely, 2^1263561266 is an apocalyptic number.

1263561266 is a deficient number, since it is larger than the sum of its proper divisors (806301934).

1263561266 is a wasteful number, since it uses less digits than its factorization.

1263561266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61609.

The product of its digits is 77760, while the sum is 38.

The square root of 1263561266 is about 35546.6069548136. The cubic root of 1263561266 is about 1081.0989231667.

The spelling of 1263561266 in words is "one billion, two hundred sixty-three million, five hundred sixty-one thousand, two hundred sixty-six".