1266111656 has 16 divisors (see below), whose sum is σ = 2380228800. Its totient is φ = 631383984.

The previous prime is 1266111653. The next prime is 1266111701. The reversal of 1266111656 is 6561116621.

It is not an unprimeable number, because it can be changed into a prime (1266111653) 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, 205760 + ... + 211823.

It is an arithmetic number, because the mean of its divisors is an integer number (148764300).

Almost surely, 2^1266111656 is an apocalyptic number.

It is an amenable number.

1266111656 is a deficient number, since it is larger than the sum of its proper divisors (1114117144).

1266111656 is a wasteful number, since it uses less digits than its factorization.

1266111656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417968 (or 417964 counting only the distinct ones).

The product of its digits is 12960, while the sum is 35.

The square root of 1266111656 is about 35582.4627590615. The cubic root of 1266111656 is about 1081.8258028099.

The spelling of 1266111656 in words is "one billion, two hundred sixty-six million, one hundred eleven thousand, six hundred fifty-six".