161845004 has 12 divisors (see below), whose sum is σ = 283519824. Its totient is φ = 80839344.

The previous prime is 161845001. The next prime is 161845007. The reversal of 161845004 is 400548161.

It is an interprime number because it is at equal distance from previous prime (161845001) and next prime (161845007).

It is not an unprimeable number, because it can be changed into a prime (161845001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16304 + ... + 24279.

It is an arithmetic number, because the mean of its divisors is an integer number (23626652).

Almost surely, 2^161845004 is an apocalyptic number.

It is an amenable number.

161845004 is a deficient number, since it is larger than the sum of its proper divisors (121674820).

161845004 is a wasteful number, since it uses less digits than its factorization.

161845004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41584 (or 41582 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 161845004 is about 12721.8317863427. The cubic root of 161845004 is about 544.9622665568.

The spelling of 161845004 in words is "one hundred sixty-one million, eight hundred forty-five thousand, four".