66868802816 has 36 divisors (see below), whose sum is σ = 133493738112. Its totient is φ = 33430058496.

The previous prime is 66868802809. The next prime is 66868802879. The reversal of 66868802816 is 61820886866.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3011531 + ... + 3033653.

It is an arithmetic number, because the mean of its divisors is an integer number (3708159392).

Almost surely, 2^66868802816 is an apocalyptic number.

It is an amenable number.

66868802816 is a deficient number, since it is larger than the sum of its proper divisors (66624935296).

66868802816 is a wasteful number, since it uses less digits than its factorization.

66868802816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33946 (or 33932 counting only the distinct ones).

The product of its (nonzero) digits is 10616832, while the sum is 59.

The spelling of 66868802816 in words is "sixty-six billion, eight hundred sixty-eight million, eight hundred two thousand, eight hundred sixteen".