1266315876 has 192 divisors, whose sum is σ = 4122316800. Its totient is φ = 327773952.

The previous prime is 1266315871. The next prime is 1266315913. The reversal of 1266315876 is 6785136621.

1266315876 is a `hidden beast` number, since 1 + 2 + 6 + 63 + 1 + 587 + 6 = 666.

It is not an unprimeable number, because it can be changed into a prime (1266315871) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 328456 + ... + 332288.

It is an arithmetic number, because the mean of its divisors is an integer number (21470400).

Almost surely, 2^1266315876 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1266315876, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2061158400).

1266315876 is an abundant number, since it is smaller than the sum of its proper divisors (2856000924).

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

1266315876 is a wasteful number, since it uses less digits than its factorization.

1266315876 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3895 (or 3887 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 1266315876 is about 35585.3323154358. The cubic root of 1266315876 is about 1081.8839647651.

The spelling of 1266315876 in words is "one billion, two hundred sixty-six million, three hundred fifteen thousand, eight hundred seventy-six".