51666838 has 8 divisors (see below), whose sum is σ = 78962688. Its totient is φ = 25345944.

The previous prime is 51666829. The next prime is 51666851. The reversal of 51666838 is 83866615.

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

It is a junction number, because it is equal to n+sod(n) for n = 51666794 and 51666803.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 243606 + ... + 243817.

It is an arithmetic number, because the mean of its divisors is an integer number (9870336).

Almost surely, 2^51666838 is an apocalyptic number.

51666838 is a deficient number, since it is larger than the sum of its proper divisors (27295850).

51666838 is a wasteful number, since it uses less digits than its factorization.

51666838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487478.

The product of its digits is 207360, while the sum is 43.

The square root of 51666838 is about 7187.9648023623. The cubic root of 51666838 is about 372.4522720105.

The spelling of 51666838 in words is "fifty-one million, six hundred sixty-six thousand, eight hundred thirty-eight".