161650 has 24 divisors (see below), whose sum is σ = 311364. Its totient is φ = 62400.

The previous prime is 161641. The next prime is 161659. The reversal of 161650 is 56161.

161650 is nontrivially palindromic in base 16.

It is an interprime number because it is at equal distance from previous prime (161641) and next prime (161659).

It can be written as a sum of positive squares in 6 ways, for example, as 31329 + 130321 = 177^2 + 361^2 .

It is a super-2 number, since 2×161650² = 52261445000, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (161659) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 2620 + ... + 2680.

2¹⁶¹⁶⁵⁰ is an apocalyptic number.

161650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161650 is a deficient number, since it is larger than the sum of its proper divisors (149714).

161650 is a wasteful number, since it uses less digits than its factorization.

161650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126 (or 121 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 161650 is about 402.0572098595. The cubic root of 161650 is about 54.4743307000.

The spelling of 161650 in words is "one hundred sixty-one thousand, six hundred fifty".