161522856 has 128 divisors (see below), whose sum is σ = 493718400. Its totient is φ = 48522240.

The previous prime is 161522843. The next prime is 161522909. The reversal of 161522856 is 658225161.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 161522856.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 372816 + ... + 373248.

It is an arithmetic number, because the mean of its divisors is an integer number (3857175).

Almost surely, 2^161522856 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 161522856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (246859200).

161522856 is an abundant number, since it is smaller than the sum of its proper divisors (332195544).

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

161522856 is a wasteful number, since it uses less digits than its factorization.

161522856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 616 (or 606 counting only the distinct ones).

The product of its digits is 28800, while the sum is 36.

The square root of 161522856 is about 12709.1642526171. The cubic root of 161522856 is about 544.6004489529.

The spelling of 161522856 in words is "one hundred sixty-one million, five hundred twenty-two thousand, eight hundred fifty-six".