168558440412 has 96 divisors (see below), whose sum is σ = 422338904064. Its totient is φ = 52197745600.

The previous prime is 168558440371. The next prime is 168558440417. The reversal of 168558440412 is 214044855861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168558440417) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1649737 + ... + 1748927.

It is an arithmetic number, because the mean of its divisors is an integer number (4399363584).

Almost surely, 2^168558440412 is an apocalyptic number.

168558440412 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 168558440412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (211169452032).

168558440412 is an abundant number, since it is smaller than the sum of its proper divisors (253780463652).

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

168558440412 is a wasteful number, since it uses less digits than its factorization.

168558440412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99399 (or 99397 counting only the distinct ones).

The product of its (nonzero) digits is 1228800, while the sum is 48.

The spelling of 168558440412 in words is "one hundred sixty-eight billion, five hundred fifty-eight million, four hundred forty thousand, four hundred twelve".