66505112656 has 10 divisors (see below), whose sum is σ = 128853655802. Its totient is φ = 33252556320.

The previous prime is 66505112623. The next prime is 66505112657. The reversal of 66505112656 is 65621150566.

66505112656 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 61851690000 + 4653422656 = 248700^2 + 68216^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66505112657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2078284755 + ... + 2078284786.

Almost surely, 2^66505112656 is an apocalyptic number.

It is an amenable number.

66505112656 is a deficient number, since it is larger than the sum of its proper divisors (62348543146).

66505112656 is a wasteful number, since it uses less digits than its factorization.

66505112656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4156569549 (or 4156569543 counting only the distinct ones).

The product of its (nonzero) digits is 324000, while the sum is 43.

The spelling of 66505112656 in words is "sixty-six billion, five hundred five million, one hundred twelve thousand, six hundred fifty-six".