161168489664 has 448 divisors, whose sum is σ = 557969513472. Its totient is φ = 39842611200.

The previous prime is 161168489659. The next prime is 161168489711. The reversal of 161168489664 is 466984861161.

It is a tau number, because it is divible by the number of its divisors (448).

It is a junction number, because it is equal to n+sod(n) for n = 161168489598 and 161168489607.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 83462779 + ... + 83464709.

It is an arithmetic number, because the mean of its divisors is an integer number (1245467664).

Almost surely, 2^161168489664 is an apocalyptic number.

161168489664 is a gapful number since it is divisible by the number (14) 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 161168489664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (278984756736).

161168489664 is an abundant number, since it is smaller than the sum of its proper divisors (396801023808).

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

161168489664 is a wasteful number, since it uses less digits than its factorization.

161168489664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2264 (or 2254 counting only the distinct ones).

The product of its digits is 11943936, while the sum is 60.

The spelling of 161168489664 in words is "one hundred sixty-one billion, one hundred sixty-eight million, four hundred eighty-nine thousand, six hundred sixty-four".