164178255866 has 4 divisors (see below), whose sum is σ = 246267383802. Its totient is φ = 82089127932.

The previous prime is 164178255859. The next prime is 164178255881. The reversal of 164178255866 is 668552871461.

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

It can be written as a sum of positive squares in only one way, i.e., 151402701025 + 12775554841 = 389105^2 + 113029^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41044563965 + ... + 41044563968.

Almost surely, 2^164178255866 is an apocalyptic number.

164178255866 is a deficient number, since it is larger than the sum of its proper divisors (82089127936).

164178255866 is an equidigital number, since it uses as much as digits as its factorization.

164178255866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82089127935.

The product of its digits is 19353600, while the sum is 59.

The spelling of 164178255866 in words is "one hundred sixty-four billion, one hundred seventy-eight million, two hundred fifty-five thousand, eight hundred sixty-six".