168139668 has 24 divisors (see below), whose sum is σ = 398759200. Its totient is φ = 55127520.

The previous prime is 168139667. The next prime is 168139669. The reversal of 168139668 is 866931861.

It is an interprime number because it is at equal distance from previous prime (168139667) and next prime (168139669).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168139661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 114118 + ... + 115581.

Almost surely, 2^168139668 is an apocalyptic number.

It is an amenable number.

168139668 is an abundant number, since it is smaller than the sum of its proper divisors (230619532).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

168139668 is a wasteful number, since it uses less digits than its factorization.

168139668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229767 (or 229765 counting only the distinct ones).

The product of its digits is 373248, while the sum is 48.

The square root of 168139668 is about 12966.8680875530. The cubic root of 168139668 is about 551.9377030095.

The spelling of 168139668 in words is "one hundred sixty-eight million, one hundred thirty-nine thousand, six hundred sixty-eight".