51666666 has 16 divisors (see below), whose sum is σ = 103499424. Its totient is φ = 17194544.

The previous prime is 51666649. The next prime is 51666707. The reversal of 51666666 is 66666615.

51666666 is a modest number, since divided by 6666 gives 5166 as remainder.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2676 + ... + 10511.

It is an arithmetic number, because the mean of its divisors is an integer number (6468714).

Almost surely, 2^51666666 is an apocalyptic number.

51666666 is an abundant number, since it is smaller than the sum of its proper divisors (51832758).

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

51666666 is a wasteful number, since it uses less digits than its factorization.

51666666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13845.

The product of its digits is 233280, while the sum is 42.

The square root of 51666666 is about 7187.9528379087. The cubic root of 51666666 is about 372.4518587096.

The spelling of 51666666 in words is "fifty-one million, six hundred sixty-six thousand, six hundred sixty-six".