65566466556 has 12 divisors (see below), whose sum is σ = 152988421992. Its totient is φ = 21855488848.

The previous prime is 65566466549. The next prime is 65566466557.

65566466556 is nontrivially palindromic in base 10.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×65566466556² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 65566466556.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65566466557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2731936095 + ... + 2731936118.

It is an arithmetic number, because the mean of its divisors is an integer number (12749035166).

Almost surely, 2^65566466556 is an apocalyptic number.

It is an amenable number.

65566466556 is an abundant number, since it is smaller than the sum of its proper divisors (87421955436).

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

65566466556 is a wasteful number, since it uses less digits than its factorization.

65566466556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5463872220 (or 5463872218 counting only the distinct ones).

The product of its digits is 116640000, while the sum is 60.

The spelling of 65566466556 in words is "sixty-five billion, five hundred sixty-six million, four hundred sixty-six thousand, five hundred fifty-six".