161585874 has 16 divisors (see below), whose sum is σ = 359079840. Its totient is φ = 53861940.

The previous prime is 161585869. The next prime is 161585891. The reversal of 161585874 is 478585161.

161585874 is a `hidden beast` number, since 1 + 61 + 5 + 8 + 587 + 4 = 666.

It is a super-2 number, since 2×161585874² = 52219989352687752, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1496112 + ... + 1496219.

It is an arithmetic number, because the mean of its divisors is an integer number (22442490).

Almost surely, 2^161585874 is an apocalyptic number.

161585874 is an abundant number, since it is smaller than the sum of its proper divisors (197493966).

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

161585874 is a wasteful number, since it uses less digits than its factorization.

161585874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2992342 (or 2992336 counting only the distinct ones).

The product of its digits is 268800, while the sum is 45.

The square root of 161585874 is about 12711.6432454659. The cubic root of 161585874 is about 544.6712648726.

The spelling of 161585874 in words is "one hundred sixty-one million, five hundred eighty-five thousand, eight hundred seventy-four".