161065165056 has 72 divisors (see below), whose sum is σ = 429623863200. Its totient is φ = 53568700416.

The previous prime is 161065165039. The next prime is 161065165103. The reversal of 161065165056 is 650561560161.

161065165056 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 161065164999 and 161065165017.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111291 + ... + 578373.

It is an arithmetic number, because the mean of its divisors is an integer number (5966998100).

Almost surely, 2^161065165056 is an apocalyptic number.

161065165056 is a gapful number since it is divisible by the number (16) 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 161065165056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (214811931600).

161065165056 is an abundant number, since it is smaller than the sum of its proper divisors (268558698144).

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

161065165056 is an equidigital number, since it uses as much as digits as its factorization.

161065165056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 467551 (or 467537 counting only the distinct ones).

The product of its (nonzero) digits is 162000, while the sum is 42.

The spelling of 161065165056 in words is "one hundred sixty-one billion, sixty-five million, one hundred sixty-five thousand, fifty-six".