66115500655056 has 40 divisors (see below), whose sum is σ = 170798737553184. Its totient is φ = 22038453655680.

The previous prime is 66115500655007. The next prime is 66115500655079. The reversal of 66115500655056 is 65055600551166.

It is a congruent number.

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, 27399070 + ... + 29714306.

Almost surely, 2^{66115500655056} is an apocalyptic number.

It is an amenable number.

66115500655056 is an abundant number, since it is smaller than the sum of its proper divisors (104683236898128).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66115500655056 is a wasteful number, since it uses less digits than its factorization.

66115500655056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2910179 (or 2910173 counting only the distinct ones).

The product of its (nonzero) digits is 4050000, while the sum is 51.

The spelling of 66115500655056 in words is "sixty-six trillion, one hundred fifteen billion, five hundred million, six hundred fifty-five thousand, fifty-six".