168419539440 has 320 divisors, whose sum is σ = 587002965120. Its totient is φ = 44381675520.

The previous prime is 168419539429. The next prime is 168419539447. The reversal of 168419539440 is 44935914861.

168419539440 is a `hidden beast` number, since 1 + 6 + 8 + 4 + 195 + 3 + 9 + 440 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168419539447) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 66805380 + ... + 66807900.

It is an arithmetic number, because the mean of its divisors is an integer number (1834384266).

Almost surely, 2^168419539440 is an apocalyptic number.

168419539440 is a gapful number since it is divisible by the number (10) 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 168419539440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (293501482560).

168419539440 is an abundant number, since it is smaller than the sum of its proper divisors (418583425680).

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

168419539440 is a wasteful number, since it uses less digits than its factorization.

168419539440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2897 (or 2885 counting only the distinct ones).

The product of its (nonzero) digits is 3732480, while the sum is 54.

The spelling of 168419539440 in words is "one hundred sixty-eight billion, four hundred nineteen million, five hundred thirty-nine thousand, four hundred forty".