161737216 has 20 divisors (see below), whose sum is σ = 323159562. Its totient is φ = 80868352.

The previous prime is 161737189. The next prime is 161737223. The reversal of 161737216 is 612737161.

It can be written as a sum of positive squares in only one way, i.e., 82882816 + 78854400 = 9104^2 + 8880^2 .

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, 157435 + ... + 158458.

Almost surely, 2^161737216 is an apocalyptic number.

161737216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

161737216 is a deficient number, since it is larger than the sum of its proper divisors (161422346).

161737216 is an frugal number, since it uses more digits than its factorization.

161737216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315911 (or 315895 counting only the distinct ones).

The product of its digits is 10584, while the sum is 34.

The square root of 161737216 is about 12717.5947411450. The cubic root of 161737216 is about 544.8412589334.

The spelling of 161737216 in words is "one hundred sixty-one million, seven hundred thirty-seven thousand, two hundred sixteen".