161563216 has 20 divisors (see below), whose sum is σ = 316993600. Its totient is φ = 79758432.

The previous prime is 161563163. The next prime is 161563231. The reversal of 161563216 is 612365161.

It is a super-2 number, since 2×161563216² = 52205345528525312, 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 3 ways as a sum of consecutive naturals, for example, 62646 + ... + 65173.

It is an arithmetic number, because the mean of its divisors is an integer number (15849680).

Almost surely, 2^161563216 is an apocalyptic number.

161563216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

161563216 is a deficient number, since it is larger than the sum of its proper divisors (155430384).

161563216 is a wasteful number, since it uses less digits than its factorization.

161563216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127906 (or 127900 counting only the distinct ones).

The product of its digits is 6480, while the sum is 31.

The square root of 161563216 is about 12710.7519840488. The cubic root of 161563216 is about 544.6458052659.

The spelling of 161563216 in words is "one hundred sixty-one million, five hundred sixty-three thousand, two hundred sixteen".