161500556 has 12 divisors (see below), whose sum is σ = 323001168. Its totient is φ = 69214512.

The previous prime is 161500543. The next prime is 161500567. The reversal of 161500556 is 655005161.

161500556 is an admirable number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2883911 + ... + 2883966.

It is an arithmetic number, because the mean of its divisors is an integer number (26916764).

Almost surely, 2^161500556 is an apocalyptic number.

It is an amenable number.

161500556 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

161500556 is a wasteful number, since it uses less digits than its factorization.

161500556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5767888 (or 5767886 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 29.

The square root of 161500556 is about 12708.2869026474. The cubic root of 161500556 is about 544.5753851131.

The spelling of 161500556 in words is "one hundred sixty-one million, five hundred thousand, five hundred fifty-six".