1266125556 has 24 divisors (see below), whose sum is σ = 2954896000. Its totient is φ = 421955712.

The previous prime is 1266125537. The next prime is 1266125557. The reversal of 1266125556 is 6555216621.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1266125557) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83445 + ... + 97443.

Almost surely, 2^1266125556 is an apocalyptic number.

It is an amenable number.

1266125556 is an abundant number, since it is smaller than the sum of its proper divisors (1688770444).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1266125556 is a wasteful number, since it uses less digits than its factorization.

1266125556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21543 (or 21541 counting only the distinct ones).

The product of its digits is 108000, while the sum is 39.

The square root of 1266125556 is about 35582.6580794634. The cubic root of 1266125556 is about 1081.8297617350.

The spelling of 1266125556 in words is "one billion, two hundred sixty-six million, one hundred twenty-five thousand, five hundred fifty-six".