66879411497866 has 16 divisors (see below), whose sum is σ = 109516708471680. Its totient is φ = 30378157089280.

The previous prime is 66879411497863. The next prime is 66879411497881.

It is a happy number.

66879411497866 is nontrivially palindromic in base 10.

66879411497866 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 66879411497866.

It is not an unprimeable number, because it can be changed into a prime (66879411497863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1078738786 + ... + 1078800781.

It is an arithmetic number, because the mean of its divisors is an integer number (6844794279480).

Almost surely, 2^{66879411497866} is an apocalyptic number.

66879411497866 is a deficient number, since it is larger than the sum of its proper divisors (42637296973814).

66879411497866 is a wasteful number, since it uses less digits than its factorization.

66879411497866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2157540989.

The product of its digits is 5267275776, while the sum is 82.

The spelling of 66879411497866 in words is "sixty-six trillion, eight hundred seventy-nine billion, four hundred eleven million, four hundred ninety-seven thousand, eight hundred sixty-six".