1266666680 has 32 divisors (see below), whose sum is σ = 2851068240. Its totient is φ = 506476800.

The previous prime is 1266666679. The next prime is 1266666689. The reversal of 1266666680 is 866666621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1266666689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 158132 + ... + 165948.

Almost surely, 2^1266666680 is an apocalyptic number.

1266666680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1266666680 is an abundant number, since it is smaller than the sum of its proper divisors (1584401560).

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

1266666680 is a wasteful number, since it uses less digits than its factorization.

1266666680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11879 (or 11875 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 47.

The square root of 1266666680 is about 35590.2610274215. The cubic root of 1266666680 is about 1081.9838593196.

The spelling of 1266666680 in words is "one billion, two hundred sixty-six million, six hundred sixty-six thousand, six hundred eighty".