12666278835 has 24 divisors (see below), whose sum is σ = 25091295840. Its totient is φ = 5790298752.

The previous prime is 12666278767. The next prime is 12666278851. The reversal of 12666278835 is 53887266621.

It is not a de Polignac number, because 12666278835 - 2³³ = 4076344243 is a prime.

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 23 ways as a sum of consecutive naturals, for example, 20104890 + ... + 20105519.

It is an arithmetic number, because the mean of its divisors is an integer number (1045470660).

Almost surely, 2^12666278835 is an apocalyptic number.

12666278835 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12666278835 is a deficient number, since it is larger than the sum of its proper divisors (12425017005).

12666278835 is a wasteful number, since it uses less digits than its factorization.

12666278835 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40210427 (or 40210424 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 54.

The spelling of 12666278835 in words is "twelve billion, six hundred sixty-six million, two hundred seventy-eight thousand, eight hundred thirty-five".