161670 has 32 divisors (see below), whose sum is σ = 412128. Its totient is φ = 40448.

The previous prime is 161659. The next prime is 161683. The reversal of 161670 is 76161.

It is a super-2 number, since 2×161670² = 52274377800, which contains 22 as substring.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

161670 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 352 + ... + 668.

It is an arithmetic number, because the mean of its divisors is an integer number (12879).

2¹⁶¹⁶⁷⁰ is an apocalyptic number.

161670 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 161670, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (206064).

161670 is an abundant number, since it is smaller than the sum of its proper divisors (250458).

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

161670 is a wasteful number, since it uses less digits than its factorization.

161670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344.

The product of its (nonzero) digits is 252, while the sum is 21.

The square root of 161670 is about 402.0820811725. The cubic root of 161670 is about 54.4765772031.

The spelling of 161670 in words is "one hundred sixty-one thousand, six hundred seventy".