161685486 has 48 divisors (see below), whose sum is σ = 363433824. Its totient is φ = 51907392.

The previous prime is 161685473. The next prime is 161685551. The reversal of 161685486 is 684586161.

161685486 is a `hidden beast` number, since 1 + 6 + 168 + 5 + 486 = 666.

It is a super-2 number, since 2×161685486² = 52284392766112392, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 67420 + ... + 69776.

It is an arithmetic number, because the mean of its divisors is an integer number (7571538).

Almost surely, 2^161685486 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161685486, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (181716912).

161685486 is an abundant number, since it is smaller than the sum of its proper divisors (201748338).

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

161685486 is a wasteful number, since it uses less digits than its factorization.

161685486 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2505 (or 2502 counting only the distinct ones).

The product of its digits is 276480, while the sum is 45.

The square root of 161685486 is about 12715.5607819710. The cubic root of 161685486 is about 544.7831654317.

The spelling of 161685486 in words is "one hundred sixty-one million, six hundred eighty-five thousand, four hundred eighty-six".