161671680 has 160 divisors (see below), whose sum is σ = 574516800. Its totient is φ = 43094016.

The previous prime is 161671673. The next prime is 161671687. The reversal of 161671680 is 86176161.

It is an interprime number because it is at equal distance from previous prime (161671673) and next prime (161671687).

It is a tau number, because it is divible by the number of its divisors (160).

It is a super-2 number, since 2×161671680² = 52275464228044800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (161671687) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67951 + ... + 70289.

It is an arithmetic number, because the mean of its divisors is an integer number (3590730).

Almost surely, 2^161671680 is an apocalyptic number.

161671680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161671680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (287258400).

161671680 is an abundant number, since it is smaller than the sum of its proper divisors (412845120).

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

161671680 is an equidigital number, since it uses as much as digits as its factorization.

161671680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2371 (or 2349 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 161671680 is about 12715.0178922407. The cubic root of 161671680 is about 544.7676590090.

The spelling of 161671680 in words is "one hundred sixty-one million, six hundred seventy-one thousand, six hundred eighty".