66814734668 has 24 divisors (see below), whose sum is σ = 127623734784. Its totient is φ = 30354064400.

The previous prime is 66814734667. The next prime is 66814734691. The reversal of 66814734668 is 86643741866.

It is not an unprimeable number, because it can be changed into a prime (66814734661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 323480 + ... + 488127.

It is an arithmetic number, because the mean of its divisors is an integer number (5317655616).

Almost surely, 2^66814734668 is an apocalyptic number.

It is an amenable number.

66814734668 is a deficient number, since it is larger than the sum of its proper divisors (60809000116).

66814734668 is a wasteful number, since it uses less digits than its factorization.

66814734668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 813493 (or 813491 counting only the distinct ones).

The product of its digits is 27869184, while the sum is 59.

The spelling of 66814734668 in words is "sixty-six billion, eight hundred fourteen million, seven hundred thirty-four thousand, six hundred sixty-eight".