66111565116 has 24 divisors (see below), whose sum is σ = 155437881984. Its totient is φ = 21868965040.

The previous prime is 66111565073. The next prime is 66111565141. The reversal of 66111565116 is 61156511166.

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, 21026280 + ... + 21029423.

It is an arithmetic number, because the mean of its divisors is an integer number (6476578416).

Almost surely, 2^66111565116 is an apocalyptic number.

It is an amenable number.

66111565116 is an abundant number, since it is smaller than the sum of its proper divisors (89326316868).

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

66111565116 is a wasteful number, since it uses less digits than its factorization.

66111565116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42055841 (or 42055839 counting only the distinct ones).

The product of its digits is 32400, while the sum is 39.

The spelling of 66111565116 in words is "sixty-six billion, one hundred eleven million, five hundred sixty-five thousand, one hundred sixteen".