161556575 has 6 divisors (see below), whose sum is σ = 200330184. Its totient is φ = 129245240.

The previous prime is 161556553. The next prime is 161556583. The reversal of 161556575 is 575655161.

It is not a de Polignac number, because 161556575 - 2¹⁰ = 161555551 is a prime.

It is a super-2 number, since 2×161556575² = 52201053851461250, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3231107 + ... + 3231156.

It is an arithmetic number, because the mean of its divisors is an integer number (33388364).

Almost surely, 2^161556575 is an apocalyptic number.

161556575 is a deficient number, since it is larger than the sum of its proper divisors (38773609).

161556575 is an equidigital number, since it uses as much as digits as its factorization.

161556575 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6462273 (or 6462268 counting only the distinct ones).

The product of its digits is 157500, while the sum is 41.

The square root of 161556575 is about 12710.4907458367. The cubic root of 161556575 is about 544.6383426713.

The spelling of 161556575 in words is "one hundred sixty-one million, five hundred fifty-six thousand, five hundred seventy-five".