51705666 has 24 divisors (see below), whose sum is σ = 115893180. Its totient is φ = 16640736.

The previous prime is 51705659. The next prime is 51705671. The reversal of 51705666 is 66650715.

It is a happy number.

51705666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 45279441 + 6426225 = 6729^2 + 2535^2 .

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 51705666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 49005 + ... + 50048.

Almost surely, 2^51705666 is an apocalyptic number.

51705666 is an abundant number, since it is smaller than the sum of its proper divisors (64187514).

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

51705666 is a wasteful number, since it uses less digits than its factorization.

51705666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99090 (or 99087 counting only the distinct ones).

The product of its (nonzero) digits is 37800, while the sum is 36.

The square root of 51705666 is about 7190.6651987142. The cubic root of 51705666 is about 372.5455488346.

The spelling of 51705666 in words is "fifty-one million, seven hundred five thousand, six hundred sixty-six".