66814746668 has 24 divisors (see below), whose sum is σ = 120146037312. Its totient is φ = 32488210944.

The previous prime is 66814746659. The next prime is 66814746671. The reversal of 66814746668 is 86664741866.

It is a self number, because there is not a number n which added to its sum of digits gives 66814746668.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 186605 + ... + 410427.

It is an arithmetic number, because the mean of its divisors is an integer number (5006084888).

Almost surely, 2^66814746668 is an apocalyptic number.

It is an amenable number.

66814746668 is a deficient number, since it is larger than the sum of its proper divisors (53331290644).

66814746668 is a wasteful number, since it uses less digits than its factorization.

66814746668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225881 (or 225879 counting only the distinct ones).

The product of its digits is 55738368, while the sum is 62.

The spelling of 66814746668 in words is "sixty-six billion, eight hundred fourteen million, seven hundred forty-six thousand, six hundred sixty-eight".