66437666 has 32 divisors (see below), whose sum is σ = 111767040. Its totient is φ = 29465856.

The previous prime is 66437663. The next prime is 66437677. The reversal of 66437666 is 66673466.

66437666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66437663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41615 + ... + 43181.

It is an arithmetic number, because the mean of its divisors is an integer number (3492720).

Almost surely, 2^66437666 is an apocalyptic number.

66437666 is a deficient number, since it is larger than the sum of its proper divisors (45329374).

66437666 is a wasteful number, since it uses less digits than its factorization.

66437666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1658.

The product of its digits is 653184, while the sum is 44.

The square root of 66437666 is about 8150.9303763435. The cubic root of 66437666 is about 405.0153243198.

The spelling of 66437666 in words is "sixty-six million, four hundred thirty-seven thousand, six hundred sixty-six".