1266566156 has 12 divisors (see below), whose sum is σ = 2231367600. Its totient is φ = 629032560.

The previous prime is 1266566149. The next prime is 1266566207. The reversal of 1266566156 is 6516656621.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1061960 + ... + 1063151.

It is an arithmetic number, because the mean of its divisors is an integer number (185947300).

Almost surely, 2^1266566156 is an apocalyptic number.

It is an amenable number.

1266566156 is a deficient number, since it is larger than the sum of its proper divisors (964801444).

1266566156 is a wasteful number, since it uses less digits than its factorization.

1266566156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2125264 (or 2125262 counting only the distinct ones).

The product of its digits is 388800, while the sum is 44.

The square root of 1266566156 is about 35588.8487591268. The cubic root of 1266566156 is about 1081.9552361034.

It can be divided in two parts, 126656615 and 6, that added together give a palindrome (126656621).

The spelling of 1266566156 in words is "one billion, two hundred sixty-six million, five hundred sixty-six thousand, one hundred fifty-six".