166818334849 has 4 divisors (see below), whose sum is σ = 167238532564. Its totient is φ = 166398137136.

The previous prime is 166818334829. The next prime is 166818334853. The reversal of 166818334849 is 948433818661.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 52477646400 + 114340688449 = 229080^2 + 338143^2 .

It is a cyclic number.

It is not a de Polignac number, because 166818334849 - 2¹¹ = 166818332801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166818334829) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 210098262 + ... + 210099055.

It is an arithmetic number, because the mean of its divisors is an integer number (41809633141).

Almost surely, 2^166818334849 is an apocalyptic number.

It is an amenable number.

166818334849 is a deficient number, since it is larger than the sum of its proper divisors (420197715).

166818334849 is an equidigital number, since it uses as much as digits as its factorization.

166818334849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420197714.

The product of its digits is 23887872, while the sum is 61.

The spelling of 166818334849 in words is "one hundred sixty-six billion, eight hundred eighteen million, three hundred thirty-four thousand, eight hundred forty-nine".