66864688646866 has 64 divisors (see below), whose sum is σ = 112392119203200. Its totient is φ = 29576553408000.

The previous prime is 66864688646843. The next prime is 66864688646879.

66864688646866 is nontrivially palindromic in base 10.

It is a super-3 number, since 3×66864688646866³ (a number of 42 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 745771696 + ... + 745861348.

It is an arithmetic number, because the mean of its divisors is an integer number (1756126862550).

Almost surely, 2^{66864688646866} is an apocalyptic number.

66864688646866 is a deficient number, since it is larger than the sum of its proper divisors (45527430556334).

66864688646866 is a wasteful number, since it uses less digits than its factorization.

66864688646866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95515.

The product of its digits is 110075314176, while the sum is 88.

The spelling of 66864688646866 in words is "sixty-six trillion, eight hundred sixty-four billion, six hundred eighty-eight million, six hundred forty-six thousand, eight hundred sixty-six".