168371645 has 16 divisors (see below), whose sum is σ = 223471920. Its totient is φ = 120973824.

The previous prime is 168371641. The next prime is 168371659. The reversal of 168371645 is 546173861.

It can be written as a sum of positive squares in 8 ways, for example, as 9132484 + 159239161 = 3022^2 + 12619^2 .

It is a cyclic number.

It is not a de Polignac number, because 168371645 - 2² = 168371641 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168371641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32600 + ... + 37409.

It is an arithmetic number, because the mean of its divisors is an integer number (13966995).

Almost surely, 2^168371645 is an apocalyptic number.

It is an amenable number.

168371645 is a deficient number, since it is larger than the sum of its proper divisors (55100275).

168371645 is a wasteful number, since it uses less digits than its factorization.

168371645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70064.

The product of its digits is 120960, while the sum is 41.

The square root of 168371645 is about 12975.8099939850. The cubic root of 168371645 is about 552.1914167154.

The spelling of 168371645 in words is "one hundred sixty-eight million, three hundred seventy-one thousand, six hundred forty-five".