168646609872 has 400 divisors, whose sum is σ = 558076780800. Its totient is φ = 48707702784.

The previous prime is 168646609867. The next prime is 168646609931. The reversal of 168646609872 is 278906646861.

168646609872 is a `hidden beast` number, since 1 + 6 + 86 + 466 + 0 + 98 + 7 + 2 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 171562693 + ... + 171563675.

It is an arithmetic number, because the mean of its divisors is an integer number (1395191952).

Almost surely, 2^168646609872 is an apocalyptic number.

168646609872 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 168646609872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (279038390400).

168646609872 is an abundant number, since it is smaller than the sum of its proper divisors (389430170928).

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

168646609872 is a wasteful number, since it uses less digits than its factorization.

168646609872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1632 (or 1617 counting only the distinct ones).

The product of its (nonzero) digits is 41803776, while the sum is 63.

The spelling of 168646609872 in words is "one hundred sixty-eight billion, six hundred forty-six million, six hundred nine thousand, eight hundred seventy-two".