66511560116 has 12 divisors (see below), whose sum is σ = 116403514500. Its totient is φ = 33253413120.

The previous prime is 66511560109. The next prime is 66511560163. The reversal of 66511560116 is 61106511566.

It can be written as a sum of positive squares in 2 ways, for example, as 36653102500 + 29858457616 = 191450^2 + 172796^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 66511560116.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 527741 + ... + 641508.

It is an arithmetic number, because the mean of its divisors is an integer number (9700292875).

Almost surely, 2^66511560116 is an apocalyptic number.

It is an amenable number.

66511560116 is a deficient number, since it is larger than the sum of its proper divisors (49891954384).

66511560116 is a wasteful number, since it uses less digits than its factorization.

66511560116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1183474 (or 1183472 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 38.

The spelling of 66511560116 in words is "sixty-six billion, five hundred eleven million, five hundred sixty thousand, one hundred sixteen".