161543889408 has 320 divisors, whose sum is σ = 478733359104. Its totient is φ = 47996928000.

The previous prime is 161543889407. The next prime is 161543889413. The reversal of 161543889408 is 804988345161.

It is not an unprimeable number, because it can be changed into a prime (161543889407) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 373080360 + ... + 373080792.

Almost surely, 2^161543889408 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 161543889408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (239366679552).

161543889408 is an abundant number, since it is smaller than the sum of its proper divisors (317189469696).

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

161543889408 is a wasteful number, since it uses less digits than its factorization.

161543889408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 847 (or 831 counting only the distinct ones).

The product of its (nonzero) digits is 6635520, while the sum is 57.

The spelling of 161543889408 in words is "one hundred sixty-one billion, five hundred forty-three million, eight hundred eighty-nine thousand, four hundred eight".