66630686 has 4 divisors (see below), whose sum is σ = 99946032. Its totient is φ = 33315342.

The previous prime is 66630679. The next prime is 66630691. The reversal of 66630686 is 68603666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16657670 + ... + 16657673.

It is an arithmetic number, because the mean of its divisors is an integer number (24986508).

Almost surely, 2^66630686 is an apocalyptic number.

66630686 is a deficient number, since it is larger than the sum of its proper divisors (33315346).

66630686 is a wasteful number, since it uses less digits than its factorization.

66630686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33315345.

The product of its (nonzero) digits is 186624, while the sum is 41.

The square root of 66630686 is about 8162.7621550551. The cubic root of 66630686 is about 405.4071726833.

The spelling of 66630686 in words is "sixty-six million, six hundred thirty thousand, six hundred eighty-six".