66888688688866 has 32 divisors (see below), whose sum is σ = 115425597208320. Its totient is φ = 28751083779600.

The previous prime is 66888688688791. The next prime is 66888688688909.

66888688688866 is nontrivially palindromic in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 146042640 + ... + 146499931.

It is an arithmetic number, because the mean of its divisors is an integer number (3607049912760).

Almost surely, 2^{66888688688866} is an apocalyptic number.

66888688688866 is a deficient number, since it is larger than the sum of its proper divisors (48536908519454).

66888688688866 is a wasteful number, since it uses less digits than its factorization.

66888688688866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292543150.

The product of its digits is 782757789696, while the sum is 100.

The spelling of 66888688688866 in words is "sixty-six trillion, eight hundred eighty-eight billion, six hundred eighty-eight million, six hundred eighty-eight thousand, eight hundred sixty-six".