66114661161 has 32 divisors (see below), whose sum is σ = 90706936320. Its totient is φ = 42816743424.

The previous prime is 66114661157. The next prime is 66114661169. The reversal of 66114661161 is 16116641166.

66114661161 is a nontrivial binomial coefficient, being equal to C(363634, 2).

It is not a de Polignac number, because 66114661161 - 2² = 66114661157 is a prime.

It is a super-2 number, since 2×66114661161² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66114661169) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28907760 + ... + 28910046.

It is an arithmetic number, because the mean of its divisors is an integer number (2834591760).

Almost surely, 2^66114661161 is an apocalyptic number.

66114661161 is the 363633-rd triangular number and also the 181817-th hexagonal number.

It is an amenable number.

66114661161 is a deficient number, since it is larger than the sum of its proper divisors (24592275159).

66114661161 is a wasteful number, since it uses less digits than its factorization.

66114661161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4065.

The product of its digits is 31104, while the sum is 39.

The spelling of 66114661161 in words is "sixty-six billion, one hundred fourteen million, six hundred sixty-one thousand, one hundred sixty-one".