168338681 has 4 divisors (see below), whose sum is σ = 192387072. Its totient is φ = 144290292.

The previous prime is 168338669. The next prime is 168338693. The reversal of 168338681 is 186833861.

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.

It is an interprime number because it is at equal distance from previous prime (168338669) and next prime (168338693).

It is a cyclic number.

It is not a de Polignac number, because 168338681 - 2⁶ = 168338617 is a prime.

It is a super-2 number, since 2×168338681² = 56675823041639522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168338281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12024185 + ... + 12024198.

It is an arithmetic number, because the mean of its divisors is an integer number (48096768).

Almost surely, 2^168338681 is an apocalyptic number.

It is an amenable number.

168338681 is a deficient number, since it is larger than the sum of its proper divisors (24048391).

168338681 is an equidigital number, since it uses as much as digits as its factorization.

168338681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24048390.

The product of its digits is 165888, while the sum is 44.

The square root of 168338681 is about 12974.5397220865. The cubic root of 168338681 is about 552.1553781336.

The spelling of 168338681 in words is "one hundred sixty-eight million, three hundred thirty-eight thousand, six hundred eighty-one".