66808654256 has 10 divisors (see below), whose sum is σ = 129441767652. Its totient is φ = 33404327120.

The previous prime is 66808654243. The next prime is 66808654267. The reversal of 66808654256 is 65245680866.

66808654256 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2087770430 + ... + 2087770461.

Almost surely, 2^66808654256 is an apocalyptic number.

It is an amenable number.

66808654256 is a deficient number, since it is larger than the sum of its proper divisors (62633113396).

66808654256 is a wasteful number, since it uses less digits than its factorization.

66808654256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4175540899 (or 4175540893 counting only the distinct ones).

The product of its (nonzero) digits is 16588800, while the sum is 56.

The spelling of 66808654256 in words is "sixty-six billion, eight hundred eight million, six hundred fifty-four thousand, two hundred fifty-six".