51506666 has 8 divisors (see below), whose sum is σ = 78348384. Its totient is φ = 25390540.

The previous prime is 51506659. The next prime is 51506669. The reversal of 51506666 is 66660515.

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

51506666 is a modest number, since divided by 6666 gives 5150 as remainder.

It is not an unprimeable number, because it can be changed into a prime (51506669) 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, 181220 + ... + 181503.

It is an arithmetic number, because the mean of its divisors is an integer number (9793548).

Almost surely, 2^51506666 is an apocalyptic number.

51506666 is a deficient number, since it is larger than the sum of its proper divisors (26841718).

51506666 is a wasteful number, since it uses less digits than its factorization.

51506666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362796.

The product of its (nonzero) digits is 32400, while the sum is 35.

The square root of 51506666 is about 7176.8144744030. The cubic root of 51506666 is about 372.0669947170.

The spelling of 51506666 in words is "fifty-one million, five hundred six thousand, six hundred sixty-six".