66278687266 has 24 divisors (see below), whose sum is σ = 109362056832. Its totient is φ = 30103411800.

The previous prime is 66278687249. The next prime is 66278687269.

66278687266 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 66278687198 and 66278687207.

It is not an unprimeable number, because it can be changed into a prime (66278687269) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 210231 + ... + 420421.

It is an arithmetic number, because the mean of its divisors is an integer number (4556752368).

Almost surely, 2^66278687266 is an apocalyptic number.

66278687266 is a deficient number, since it is larger than the sum of its proper divisors (43083369566).

66278687266 is a wasteful number, since it uses less digits than its factorization.

66278687266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211518 (or 211507 counting only the distinct ones).

The product of its digits is 97542144, while the sum is 64.

The spelling of 66278687266 in words is "sixty-six billion, two hundred seventy-eight million, six hundred eighty-seven thousand, two hundred sixty-six".