168649449121 has 4 divisors (see below), whose sum is σ = 168650593200. Its totient is φ = 168648305044.

The previous prime is 168649449109. The next prime is 168649449139. The reversal of 168649449121 is 121944946861.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 168649449121 - 2¹¹ = 168649447073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168649449821) 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, 311311 + ... + 658948.

It is an arithmetic number, because the mean of its divisors is an integer number (42162648300).

Almost surely, 2^168649449121 is an apocalyptic number.

It is an amenable number.

168649449121 is a deficient number, since it is larger than the sum of its proper divisors (1144079).

168649449121 is an equidigital number, since it uses as much as digits as its factorization.

168649449121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1144078.

The product of its digits is 2985984, while the sum is 55.

The spelling of 168649449121 in words is "one hundred sixty-eight billion, six hundred forty-nine million, four hundred forty-nine thousand, one hundred twenty-one".