161646344000 has 112 divisors (see below), whose sum is σ = 406293401280. Its totient is φ = 63693273600.

The previous prime is 161646343997. The next prime is 161646344009. The reversal of 161646344000 is 443646161.

It is a happy number.

It is a super-2 number, since 2×161646344000² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161646344009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 385211 + ... + 686789.

Almost surely, 2^161646344000 is an apocalyptic number.

161646344000 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 161646344000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (203146700640).

161646344000 is an abundant number, since it is smaller than the sum of its proper divisors (244647057280).

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

161646344000 is an equidigital number, since it uses as much as digits as its factorization.

161646344000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301673 (or 301653 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 35.

The spelling of 161646344000 in words is "one hundred sixty-one billion, six hundred forty-six million, three hundred forty-four thousand".