161696256 has 120 divisors (see below), whose sum is σ = 452575200. Its totient is φ = 51296256.

The previous prime is 161696243. The next prime is 161696287. The reversal of 161696256 is 652696161.

It is a super-2 number, since 2×161696256² = 52291358408835072, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 812445 + ... + 812643.

It is an arithmetic number, because the mean of its divisors is an integer number (3771460).

Almost surely, 2^161696256 is an apocalyptic number.

161696256 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 161696256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (226287600).

161696256 is an abundant number, since it is smaller than the sum of its proper divisors (290878944).

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

161696256 is an equidigital number, since it uses as much as digits as its factorization.

161696256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266 (or 227 counting only the distinct ones).

The product of its digits is 116640, while the sum is 42.

The square root of 161696256 is about 12715.9842717739. The cubic root of 161696256 is about 544.7952613111.

The spelling of 161696256 in words is "one hundred sixty-one million, six hundred ninety-six thousand, two hundred fifty-six".