666178216124 has 24 divisors (see below), whose sum is σ = 1213721975088. Its totient is φ = 319647150720.

The previous prime is 666178216097. The next prime is 666178216127. The reversal of 666178216124 is 421612871666.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666178216127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30819362 + ... + 30840969.

It is an arithmetic number, because the mean of its divisors is an integer number (50571748962).

Almost surely, 2^666178216124 is an apocalyptic number.

It is an amenable number.

666178216124 is a deficient number, since it is larger than the sum of its proper divisors (547543758964).

666178216124 is a wasteful number, since it uses less digits than its factorization.

666178216124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61660445 (or 61660443 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 50.

The spelling of 666178216124 in words is "six hundred sixty-six billion, one hundred seventy-eight million, two hundred sixteen thousand, one hundred twenty-four".