161663845 has 8 divisors (see below), whose sum is σ = 221710464. Its totient is φ = 110855184.

The previous prime is 161663809. The next prime is 161663851. The reversal of 161663845 is 548366161.

161663845 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161663845 - 2¹⁷ = 161532773 is a prime.

It is a super-2 number, since 2×161663845² = 52270397560368050, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 161663798 and 161663807.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2309449 + ... + 2309518.

It is an arithmetic number, because the mean of its divisors is an integer number (27713808).

Almost surely, 2^161663845 is an apocalyptic number.

It is an amenable number.

161663845 is a deficient number, since it is larger than the sum of its proper divisors (60046619).

161663845 is an equidigital number, since it uses as much as digits as its factorization.

161663845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4618979.

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

The square root of 161663845 is about 12714.7097882728. The cubic root of 161663845 is about 544.7588586147.

The spelling of 161663845 in words is "one hundred sixty-one million, six hundred sixty-three thousand, eight hundred forty-five".