66668814 has 12 divisors (see below), whose sum is σ = 144449136. Its totient is φ = 22222932.

The previous prime is 66668809. The next prime is 66668827. The reversal of 66668814 is 41886666.

It is a self number, because there is not a number n which added to its sum of digits gives 66668814.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1851894 + ... + 1851929.

It is an arithmetic number, because the mean of its divisors is an integer number (12037428).

Almost surely, 2^66668814 is an apocalyptic number.

66668814 is an abundant number, since it is smaller than the sum of its proper divisors (77780322).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66668814 is a wasteful number, since it uses less digits than its factorization.

66668814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3703831 (or 3703828 counting only the distinct ones).

The product of its digits is 331776, while the sum is 45.

The square root of 66668814 is about 8165.0973049928. The cubic root of 66668814 is about 405.4844864965.

The spelling of 66668814 in words is "sixty-six million, six hundred sixty-eight thousand, eight hundred fourteen".