161205672 has 32 divisors (see below), whose sum is σ = 406195200. Its totient is φ = 53311104.

The previous prime is 161205661. The next prime is 161205677. The reversal of 161205672 is 276502161.

It is not an unprimeable number, because it can be changed into a prime (161205677) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23397 + ... + 29492.

It is an arithmetic number, because the mean of its divisors is an integer number (12693600).

Almost surely, 2^161205672 is an apocalyptic number.

161205672 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

161205672 is an abundant number, since it is smaller than the sum of its proper divisors (244989528).

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

161205672 is a wasteful number, since it uses less digits than its factorization.

161205672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53025 (or 53021 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 161205672 is about 12696.6795659338. The cubic root of 161205672 is about 544.2437362951.

The spelling of 161205672 in words is "one hundred sixty-one million, two hundred five thousand, six hundred seventy-two".