168216745 has 4 divisors (see below), whose sum is σ = 201860100. Its totient is φ = 134573392.

The previous prime is 168216743. The next prime is 168216787. The reversal of 168216745 is 547612861.

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 82246761 + 85969984 = 9069^2 + 9272^2 .

It is a cyclic number.

It is not a de Polignac number, because 168216745 - 2¹ = 168216743 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 168216698 and 168216707.

It is not an unprimeable number, because it can be changed into a prime (168216743) by changing a digit.

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, 16821670 + ... + 16821679.

It is an arithmetic number, because the mean of its divisors is an integer number (50465025).

Almost surely, 2^168216745 is an apocalyptic number.

It is an amenable number.

168216745 is a deficient number, since it is larger than the sum of its proper divisors (33643355).

168216745 is an equidigital number, since it uses as much as digits as its factorization.

168216745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33643354.

The product of its digits is 80640, while the sum is 40.

The square root of 168216745 is about 12969.8398216786. The cubic root of 168216745 is about 552.0220281502.

The spelling of 168216745 in words is "one hundred sixty-eight million, two hundred sixteen thousand, seven hundred forty-five".