168347825666 has 4 divisors (see below), whose sum is σ = 252521738502. Its totient is φ = 84173912832.

The previous prime is 168347825647. The next prime is 168347825669. The reversal of 168347825666 is 666528743861.

It is a happy number.

168347825666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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., 89314311025 + 79033514641 = 298855^2 + 281129^2 .

It is a junction number, because it is equal to n+sod(n) for n = 168347825599 and 168347825608.

It is not an unprimeable number, because it can be changed into a prime (168347825669) 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 as a sum of consecutive naturals, namely, 42086956415 + ... + 42086956418.

Almost surely, 2^168347825666 is an apocalyptic number.

168347825666 is a deficient number, since it is larger than the sum of its proper divisors (84173912836).

168347825666 is an equidigital number, since it uses as much as digits as its factorization.

168347825666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84173912835.

The product of its digits is 69672960, while the sum is 62.

The spelling of 168347825666 in words is "one hundred sixty-eight billion, three hundred forty-seven million, eight hundred twenty-five thousand, six hundred sixty-six".