66110616511 has 4 divisors (see below), whose sum is σ = 66111292800. Its totient is φ = 66109940224.

The previous prime is 66110616469. The next prime is 66110616541. The reversal of 66110616511 is 11561601166.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 11561601166 = 2 ⋅5780800583.

It is a cyclic number.

It is not a de Polignac number, because 66110616511 - 2¹⁷ = 66110485439 is a prime.

It is a super-2 number, since 2×66110616511² (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 (66110616541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160351 + ... + 397408.

It is an arithmetic number, because the mean of its divisors is an integer number (16527823200).

Almost surely, 2^66110616511 is an apocalyptic number.

66110616511 is a deficient number, since it is larger than the sum of its proper divisors (676289).

66110616511 is a wasteful number, since it uses less digits than its factorization.

66110616511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 676288.

The product of its (nonzero) digits is 6480, while the sum is 34.

The spelling of 66110616511 in words is "sixty-six billion, one hundred ten million, six hundred sixteen thousand, five hundred eleven".