1266660878 has 72 divisors (see below), whose sum is σ = 2377960200. Its totient is φ = 503114976.

The previous prime is 1266660841. The next prime is 1266660919. The reversal of 1266660878 is 8780666621.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 35 ways as a sum of consecutive naturals, for example, 11620688 + ... + 11620796.

It is an arithmetic number, because the mean of its divisors is an integer number (33027225).

Almost surely, 2^1266660878 is an apocalyptic number.

1266660878 is a deficient number, since it is larger than the sum of its proper divisors (1111299322).

1266660878 is a wasteful number, since it uses less digits than its factorization.

1266660878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302 (or 216 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 50.

The square root of 1266660878 is about 35590.1795162654. The cubic root of 1266660878 is about 1081.9822072986.

The spelling of 1266660878 in words is "one billion, two hundred sixty-six million, six hundred sixty thousand, eight hundred seventy-eight".