161144240640 has 320 divisors, whose sum is σ = 535079609856. Its totient is φ = 41340321792.

The previous prime is 161144240603. The next prime is 161144240657. The reversal of 161144240640 is 46042441161.

It is a tau number, because it is divible by the number of its divisors (320).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22122439 + ... + 22129721.

Almost surely, 2^161144240640 is an apocalyptic number.

161144240640 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 161144240640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (267539804928).

161144240640 is an abundant number, since it is smaller than the sum of its proper divisors (373935369216).

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

161144240640 is an equidigital number, since it uses as much as digits as its factorization.

161144240640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7419 (or 7403 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 33.

The spelling of 161144240640 in words is "one hundred sixty-one billion, one hundred forty-four million, two hundred forty thousand, six hundred forty".