161868858 has 16 divisors (see below), whose sum is σ = 332487840. Its totient is φ = 52497936.

The previous prime is 161868803. The next prime is 161868869. The reversal of 161868858 is 858868161.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 161868858.

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, 364348 + ... + 364791.

It is an arithmetic number, because the mean of its divisors is an integer number (20780490).

Almost surely, 2^161868858 is an apocalyptic number.

161868858 is an abundant number, since it is smaller than the sum of its proper divisors (170618982).

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

161868858 is a wasteful number, since it uses less digits than its factorization.

161868858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 729181.

The product of its digits is 737280, while the sum is 51.

The square root of 161868858 is about 12722.7692740221. The cubic root of 161868858 is about 544.9890388616.

The spelling of 161868858 in words is "one hundred sixty-one million, eight hundred sixty-eight thousand, eight hundred fifty-eight".