161671552 has 32 divisors (see below), whose sum is σ = 368093520. Its totient is φ = 69287424.

The previous prime is 161671511. The next prime is 161671579. The reversal of 161671552 is 255176161.

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×161671552² = 52275381452177408, which contains 22 as substring.

It is a congruent 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, 89323 + ... + 91114.

Almost surely, 2^161671552 is an apocalyptic number.

It is an amenable number.

161671552 is an abundant number, since it is smaller than the sum of its proper divisors (206421968).

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

161671552 is an equidigital number, since it uses as much as digits as its factorization.

161671552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180458 (or 180446 counting only the distinct ones).

The product of its digits is 12600, while the sum is 34.

The square root of 161671552 is about 12715.0128588217. The cubic root of 161671552 is about 544.7675152397.

The spelling of 161671552 in words is "one hundred sixty-one million, six hundred seventy-one thousand, five hundred fifty-two".