161873856 has 112 divisors (see below), whose sum is σ = 480669600. Its totient is φ = 53415936.

The previous prime is 161873843. The next prime is 161873867. The reversal of 161873856 is 658378161.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 194850 + ... + 195678.

Almost surely, 2^161873856 is an apocalyptic number.

161873856 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 161873856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (240334800).

161873856 is an abundant number, since it is smaller than the sum of its proper divisors (318795744).

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

161873856 is a wasteful number, since it uses less digits than its factorization.

161873856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 963 (or 947 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The square root of 161873856 is about 12722.9656920075. The cubic root of 161873856 is about 544.9946479849.

The spelling of 161873856 in words is "one hundred sixty-one million, eight hundred seventy-three thousand, eight hundred fifty-six".