66516605111 has 4 divisors (see below), whose sum is σ = 72563569224. Its totient is φ = 60469641000.

The previous prime is 66516605101. The next prime is 66516605147. The reversal of 66516605111 is 11150661566.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66516605111 - 2¹⁴ = 66516588727 is a prime.

It is a super-2 number, since 2×66516605111² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66516605101) by changing a digit.

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, 3023482040 + ... + 3023482061.

It is an arithmetic number, because the mean of its divisors is an integer number (18140892306).

Almost surely, 2^66516605111 is an apocalyptic number.

66516605111 is a deficient number, since it is larger than the sum of its proper divisors (6046964113).

66516605111 is a wasteful number, since it uses less digits than its factorization.

66516605111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6046964112.

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

The spelling of 66516605111 in words is "sixty-six billion, five hundred sixteen million, six hundred five thousand, one hundred eleven".