168043657 has 16 divisors (see below), whose sum is σ = 188213760. Its totient is φ = 149098752.

The previous prime is 168043651. The next prime is 168043669. The reversal of 168043657 is 756340861.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 168043657 - 2¹⁵ = 168010889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168043651) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70863 + ... + 73195.

It is an arithmetic number, because the mean of its divisors is an integer number (11763360).

Almost surely, 2^168043657 is an apocalyptic number.

168043657 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

168043657 is a deficient number, since it is larger than the sum of its proper divisors (20170103).

168043657 is a wasteful number, since it uses less digits than its factorization.

168043657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2592.

The product of its (nonzero) digits is 120960, while the sum is 40.

The square root of 168043657 is about 12963.1653927581. The cubic root of 168043657 is about 551.8326273084.

The spelling of 168043657 in words is "one hundred sixty-eight million, forty-three thousand, six hundred fifty-seven".