161556576 has 48 divisors (see below), whose sum is σ = 449036784. Its totient is φ = 50683904.

The previous prime is 161556553. The next prime is 161556583. The reversal of 161556576 is 675655161.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×161556576² = 52201054497687552, which contains 22 as substring.

It is a congruent number.

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, 47865 + ... + 51128.

It is an arithmetic number, because the mean of its divisors is an integer number (9354933).

Almost surely, 2^161556576 is an apocalyptic number.

161556576 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

161556576 is an abundant number, since it is smaller than the sum of its proper divisors (287480208).

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

161556576 is a wasteful number, since it uses less digits than its factorization.

161556576 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99023 (or 99015 counting only the distinct ones).

The product of its digits is 189000, while the sum is 42.

The square root of 161556576 is about 12710.4907851743. The cubic root of 161556576 is about 544.6383437950.

The spelling of 161556576 in words is "one hundred sixty-one million, five hundred fifty-six thousand, five hundred seventy-six".