51666166 has 8 divisors (see below), whose sum is σ = 77556024. Its totient is φ = 25814160.

The previous prime is 51666163. The next prime is 51666193. The reversal of 51666166 is 66166615.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51666163) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5760 + ... + 11683.

It is an arithmetic number, because the mean of its divisors is an integer number (9694503).

Almost surely, 2^51666166 is an apocalyptic number.

51666166 is a deficient number, since it is larger than the sum of its proper divisors (25889858).

51666166 is a wasteful number, since it uses less digits than its factorization.

51666166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18926.

The product of its digits is 38880, while the sum is 37.

The square root of 51666166 is about 7187.9180574072. The cubic root of 51666166 is about 372.4506572481.

The spelling of 51666166 in words is "fifty-one million, six hundred sixty-six thousand, one hundred sixty-six".