66687278666 has 32 divisors (see below), whose sum is σ = 107880895872. Its totient is φ = 30803691520.

The previous prime is 66687278663. The next prime is 66687278701.

It is a happy number.

66687278666 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 66687278596 and 66687278605.

It is not an unprimeable number, because it can be changed into a prime (66687278663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 487130 + ... + 608826.

It is an arithmetic number, because the mean of its divisors is an integer number (3371277996).

Almost surely, 2^66687278666 is an apocalyptic number.

66687278666 is a deficient number, since it is larger than the sum of its proper divisors (41193617206).

66687278666 is a wasteful number, since it uses less digits than its factorization.

66687278666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122014.

The product of its digits is 292626432, while the sum is 68.

The spelling of 66687278666 in words is "sixty-six billion, six hundred eighty-seven million, two hundred seventy-eight thousand, six hundred sixty-six".