161603072 has 20 divisors (see below), whose sum is σ = 322891536. Its totient is φ = 80801280.

The previous prime is 161603059. The next prime is 161603081. The reversal of 161603072 is 270306161.

It is a super-2 number, since 2×161603072² = 52231105759674368, 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 as a sum of consecutive naturals, namely, 157304 + ... + 158327.

Almost surely, 2^161603072 is an apocalyptic number.

It is an amenable number.

161603072 is a deficient number, since it is larger than the sum of its proper divisors (161288464).

161603072 is an frugal number, since it uses more digits than its factorization.

161603072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315649 (or 315633 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 161603072 is about 12712.3196939032. The cubic root of 161603072 is about 544.6905877747.

The spelling of 161603072 in words is "one hundred sixty-one million, six hundred three thousand, seventy-two".