66886977968866 has 16 divisors (see below), whose sum is σ = 109451593128960. Its totient is φ = 30403123294480.

The previous prime is 66886977968851. The next prime is 66886977968903.

66886977968866 is nontrivially palindromic in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14212575 + ... + 18324061.

It is an arithmetic number, because the mean of its divisors is an integer number (6840724570560).

Almost surely, 2^{66886977968866} is an apocalyptic number.

66886977968866 is a deficient number, since it is larger than the sum of its proper divisors (42564615160094).

66886977968866 is a wasteful number, since it uses less digits than its factorization.

66886977968866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4850969.

The product of its digits is 758487711744, while the sum is 100.

The spelling of 66886977968866 in words is "sixty-six trillion, eight hundred eighty-six billion, nine hundred seventy-seven million, nine hundred sixty-eight thousand, eight hundred sixty-six".