161988704000 has 288 divisors, whose sum is σ = 415750188672. Its totient is φ = 62853120000.

The previous prime is 161988703979. The next prime is 161988704023. The reversal of 161988704000 is 407889161.

161988704000 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 408031802 + ... + 408032198.

It is an arithmetic number, because the mean of its divisors is an integer number (1443577044).

Almost surely, 2^161988704000 is an apocalyptic number.

161988704000 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 161988704000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (207875094336).

161988704000 is an abundant number, since it is smaller than the sum of its proper divisors (253761484672).

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

161988704000 is an equidigital number, since it uses as much as digits as its factorization.

161988704000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 780 (or 756 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 44.

The spelling of 161988704000 in words is "one hundred sixty-one billion, nine hundred eighty-eight million, seven hundred four thousand".