161256188 has 6 divisors (see below), whose sum is σ = 282198336. Its totient is φ = 80628092.

The previous prime is 161256187. The next prime is 161256209. The reversal of 161256188 is 881652161.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161256181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20157020 + ... + 20157027.

It is an arithmetic number, because the mean of its divisors is an integer number (47033056).

Almost surely, 2^161256188 is an apocalyptic number.

It is an amenable number.

161256188 is a deficient number, since it is larger than the sum of its proper divisors (120942148).

161256188 is a wasteful number, since it uses less digits than its factorization.

161256188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40314051 (or 40314049 counting only the distinct ones).

The product of its digits is 23040, while the sum is 38.

The square root of 161256188 is about 12698.6687491248. The cubic root of 161256188 is about 544.3005790951.

The spelling of 161256188 in words is "one hundred sixty-one million, two hundred fifty-six thousand, one hundred eighty-eight".