51666667 has 4 divisors (see below), whose sum is σ = 55641040. Its totient is φ = 47692296.

The previous prime is 51666649. The next prime is 51666707. The reversal of 51666667 is 76666615.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51666667 - 2⁷ = 51666539 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51666617) 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, 1987167 + ... + 1987192.

It is an arithmetic number, because the mean of its divisors is an integer number (13910260).

Almost surely, 2^51666667 is an apocalyptic number.

51666667 is a deficient number, since it is larger than the sum of its proper divisors (3974373).

51666667 is a wasteful number, since it uses less digits than its factorization.

51666667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3974372.

The product of its digits is 272160, while the sum is 43.

The square root of 51666667 is about 7187.9529074696. The cubic root of 51666667 is about 372.4518611125.

The spelling of 51666667 in words is "fifty-one million, six hundred sixty-six thousand, six hundred sixty-seven".