161683546 has 4 divisors (see below), whose sum is σ = 242525322. Its totient is φ = 80841772.

The previous prime is 161683523. The next prime is 161683567. The reversal of 161683546 is 645386161.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 161671225 + 12321 = 12715^2 + 111^2 .

It is a super-2 number, since 2×161683546² = 52283138094268232, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 161683499 and 161683508.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40420885 + ... + 40420888.

Almost surely, 2^161683546 is an apocalyptic number.

161683546 is a deficient number, since it is larger than the sum of its proper divisors (80841776).

161683546 is an equidigital number, since it uses as much as digits as its factorization.

161683546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80841775.

The product of its digits is 103680, while the sum is 40.

The square root of 161683546 is about 12715.4844972577. The cubic root of 161683546 is about 544.7809865439.

The spelling of 161683546 in words is "one hundred sixty-one million, six hundred eighty-three thousand, five hundred forty-six".