66516656056 has 16 divisors (see below), whose sum is σ = 125544684240. Its totient is φ = 33038073600.

The previous prime is 66516656033. The next prime is 66516656077. The reversal of 66516656056 is 65065661566.

It is a junction number, because it is equal to n+sod(n) for n = 66516655994 and 66516656012.

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, 27530521 + ... + 27532936.

It is an arithmetic number, because the mean of its divisors is an integer number (7846542765).

Almost surely, 2^66516656056 is an apocalyptic number.

It is an amenable number.

66516656056 is a deficient number, since it is larger than the sum of its proper divisors (59028028184).

66516656056 is a wasteful number, since it uses less digits than its factorization.

66516656056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55063614 (or 55063610 counting only the distinct ones).

The product of its (nonzero) digits is 5832000, while the sum is 52.

The spelling of 66516656056 in words is "sixty-six billion, five hundred sixteen million, six hundred fifty-six thousand, fifty-six".