168440945 has 4 divisors (see below), whose sum is σ = 202129140. Its totient is φ = 134752752.

The previous prime is 168440939. The next prime is 168440957. The reversal of 168440945 is 549044861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 549044861 = 53 ⋅10359337.

It can be written as a sum of positive squares in 2 ways, for example, as 63091249 + 105349696 = 7943^2 + 10264^2 .

It is a cyclic number.

It is not a de Polignac number, because 168440945 - 2⁸ = 168440689 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16844090 + ... + 16844099.

It is an arithmetic number, because the mean of its divisors is an integer number (50532285).

Almost surely, 2^168440945 is an apocalyptic number.

It is an amenable number.

168440945 is a deficient number, since it is larger than the sum of its proper divisors (33688195).

168440945 is an equidigital number, since it uses as much as digits as its factorization.

168440945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33688194.

The product of its (nonzero) digits is 138240, while the sum is 41.

The square root of 168440945 is about 12978.4800727974. The cubic root of 168440945 is about 552.2671650524.

The spelling of 168440945 in words is "one hundred sixty-eight million, four hundred forty thousand, nine hundred forty-five".