66578172206 has 32 divisors (see below), whose sum is σ = 124928545728. Its totient is φ = 25906832640.

The previous prime is 66578172181. The next prime is 66578172211. The reversal of 66578172206 is 60227187566.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2987375 + ... + 3009578.

It is an arithmetic number, because the mean of its divisors is an integer number (3904017054).

Almost surely, 2^66578172206 is an apocalyptic number.

66578172206 is a deficient number, since it is larger than the sum of its proper divisors (58350373522).

66578172206 is a wasteful number, since it uses less digits than its factorization.

66578172206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5997036.

The product of its (nonzero) digits is 1693440, while the sum is 50.

The spelling of 66578172206 in words is "sixty-six billion, five hundred seventy-eight million, one hundred seventy-two thousand, two hundred six".