66660446 has 8 divisors (see below), whose sum is σ = 100409760. Its totient is φ = 33190528.

The previous prime is 66660439. The next prime is 66660457. The reversal of 66660446 is 64406666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69251 + ... + 70206.

It is an arithmetic number, because the mean of its divisors is an integer number (12551220).

Almost surely, 2^66660446 is an apocalyptic number.

66660446 is a deficient number, since it is larger than the sum of its proper divisors (33749314).

66660446 is a wasteful number, since it uses less digits than its factorization.

66660446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139698.

The product of its (nonzero) digits is 124416, while the sum is 38.

The square root of 66660446 is about 8164.5848639107. The cubic root of 66660446 is about 405.4675208622.

The spelling of 66660446 in words is "sixty-six million, six hundred sixty thousand, four hundred forty-six".