51666586 has 8 divisors (see below), whose sum is σ = 81578880. Its totient is φ = 24473628.

The previous prime is 51666577. The next prime is 51666617. The reversal of 51666586 is 68566615.

51666586 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a super-2 number, since 2×51666586² = 5338872217790792, which contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 679786 + ... + 679861.

It is an arithmetic number, because the mean of its divisors is an integer number (10197360).

Almost surely, 2^51666586 is an apocalyptic number.

51666586 is a deficient number, since it is larger than the sum of its proper divisors (29912294).

51666586 is a wasteful number, since it uses less digits than its factorization.

51666586 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1359668.

The product of its digits is 259200, while the sum is 43.

The square root of 51666586 is about 7187.9472730398. The cubic root of 51666586 is about 372.4516664763.

The spelling of 51666586 in words is "fifty-one million, six hundred sixty-six thousand, five hundred eighty-six".