666808140814 has 32 divisors (see below), whose sum is σ = 1089523936800. Its totient is φ = 304863068160.

The previous prime is 666808140809. The next prime is 666808140827. The reversal of 666808140814 is 418041808666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3251694 + ... + 3450670.

It is an arithmetic number, because the mean of its divisors is an integer number (34047623025).

Almost surely, 2^666808140814 is an apocalyptic number.

666808140814 is a deficient number, since it is larger than the sum of its proper divisors (422715795986).

666808140814 is a wasteful number, since it uses less digits than its factorization.

666808140814 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202068.

The product of its (nonzero) digits is 1769472, while the sum is 52.

The spelling of 666808140814 in words is "six hundred sixty-six billion, eight hundred eight million, one hundred forty thousand, eight hundred fourteen".