161664055168 has 640 divisors, whose sum is σ = 453580495200. Its totient is φ = 56646696960.

The previous prime is 161664055153. The next prime is 161664055171. The reversal of 161664055168 is 861550466161.

It is a super-2 number, since 2×161664055168² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1666639696 + ... + 1666639792.

Almost surely, 2^161664055168 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 161664055168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (226790247600).

161664055168 is an abundant number, since it is smaller than the sum of its proper divisors (291916440032).

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

161664055168 is an equidigital number, since it uses as much as digits as its factorization.

161664055168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196 (or 163 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 49.

The spelling of 161664055168 in words is "one hundred sixty-one billion, six hundred sixty-four million, fifty-five thousand, one hundred sixty-eight".