161874685 has 24 divisors (see below), whose sum is σ = 226520280. Its totient is φ = 110726784.

The previous prime is 161874677. The next prime is 161874689. The reversal of 161874685 is 586478161.

161874685 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 19263321 + 142611364 = 4389^2 + 11942^2 .

It is not a de Polignac number, because 161874685 - 2³ = 161874677 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161874689) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 194851 + ... + 195679.

It is an arithmetic number, because the mean of its divisors is an integer number (9438345).

Almost surely, 2^161874685 is an apocalyptic number.

It is an amenable number.

161874685 is a deficient number, since it is larger than the sum of its proper divisors (64645595).

161874685 is an equidigital number, since it uses as much as digits as its factorization.

161874685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1645 (or 1638 counting only the distinct ones).

The product of its digits is 322560, while the sum is 46.

The square root of 161874685 is about 12722.9982708480. The cubic root of 161874685 is about 544.9955783386.

The spelling of 161874685 in words is "one hundred sixty-one million, eight hundred seventy-four thousand, six hundred eighty-five".