161956218 has 8 divisors (see below), whose sum is σ = 323912448. Its totient is φ = 53985404.

The previous prime is 161956211. The next prime is 161956231. The reversal of 161956218 is 812659161.

161956218 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.

161956218 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (161956211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13496346 + ... + 13496357.

It is an arithmetic number, because the mean of its divisors is an integer number (40489056).

Almost surely, 2^161956218 is an apocalyptic number.

161956218 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

161956218 is a wasteful number, since it uses less digits than its factorization.

161956218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26992708.

The product of its digits is 25920, while the sum is 39.

The square root of 161956218 is about 12726.2020257420. The cubic root of 161956218 is about 545.0870640584.

The spelling of 161956218 in words is "one hundred sixty-one million, nine hundred fifty-six thousand, two hundred eighteen".