65566066556 has 6 divisors (see below), whose sum is σ = 114740616480. Its totient is φ = 32783033276.

The previous prime is 65566066549. The next prime is 65566066583.

65566066556 is nontrivially palindromic in base 10.

65566066556 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×65566066556² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8195758316 + ... + 8195758323.

It is an arithmetic number, because the mean of its divisors is an integer number (19123436080).

Almost surely, 2^65566066556 is an apocalyptic number.

It is an amenable number.

65566066556 is a deficient number, since it is larger than the sum of its proper divisors (49174549924).

65566066556 is a wasteful number, since it uses less digits than its factorization.

65566066556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16391516643 (or 16391516641 counting only the distinct ones).

The product of its (nonzero) digits is 29160000, while the sum is 56.

The spelling of 65566066556 in words is "sixty-five billion, five hundred sixty-six million, sixty-six thousand, five hundred fifty-six".