168509012724 has 144 divisors (see below), whose sum is σ = 473797868544. Its totient is φ = 50146560000.

The previous prime is 168509012723. The next prime is 168509012747. The reversal of 168509012724 is 427210905861.

168509012724 is a `hidden beast` number, since 1 + 68 + 509 + 0 + 12 + 72 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 168509012724.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168509012723) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 42114724 + ... + 42118724.

It is an arithmetic number, because the mean of its divisors is an integer number (3290262976).

Almost surely, 2^168509012724 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 168509012724, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (236898934272).

168509012724 is an abundant number, since it is smaller than the sum of its proper divisors (305288855820).

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

168509012724 is a wasteful number, since it uses less digits than its factorization.

168509012724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6958 (or 6953 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The spelling of 168509012724 in words is "one hundred sixty-eight billion, five hundred nine million, twelve thousand, seven hundred twenty-four".