168661718400 has 384 divisors, whose sum is σ = 648411356160. Its totient is φ = 37730304000.

The previous prime is 168661718399. The next prime is 168661718411. The reversal of 168661718400 is 4817166861.

It is a tau number, because it is divible by the number of its divisors (384).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 168661718400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3131700 + ... + 3185100.

It is an arithmetic number, because the mean of its divisors is an integer number (1688571240).

Almost surely, 2^168661718400 is an apocalyptic number.

168661718400 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 168661718400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (324205678080).

168661718400 is an abundant number, since it is smaller than the sum of its proper divisors (479749637760).

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

168661718400 is a wasteful number, since it uses less digits than its factorization.

168661718400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53482 (or 53465 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 48.

The spelling of 168661718400 in words is "one hundred sixty-eight billion, six hundred sixty-one million, seven hundred eighteen thousand, four hundred".