51665551166 has 8 divisors (see below), whose sum is σ = 77706098184. Its totient is φ = 25763518440.

The previous prime is 51665551159. The next prime is 51665551187. The reversal of 51665551166 is 66115556615.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 51665551166.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34627640 + ... + 34629131.

It is an arithmetic number, because the mean of its divisors is an integer number (9713262273).

Almost surely, 2^51665551166 is an apocalyptic number.

51665551166 is a deficient number, since it is larger than the sum of its proper divisors (26040547018).

51665551166 is a wasteful number, since it uses less digits than its factorization.

51665551166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69257146.

The product of its digits is 810000, while the sum is 47.

The spelling of 51665551166 in words is "fifty-one billion, six hundred sixty-five million, five hundred fifty-one thousand, one hundred sixty-six".