161544474 has 144 divisors (see below), whose sum is σ = 446787432. Its totient is φ = 41803776.

The previous prime is 161544463. The next prime is 161544497. The reversal of 161544474 is 474445161.

It is a happy number.

161544474 is a `hidden beast` number, since 161 + 54 + 447 + 4 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 96177249 + 65367225 = 9807^2 + 8085^2 .

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 71 ways as a sum of consecutive naturals, for example, 836922 + ... + 837114.

Almost surely, 2^161544474 is an apocalyptic number.

161544474 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 161544474, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (223393716).

161544474 is an abundant number, since it is smaller than the sum of its proper divisors (285242958).

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

161544474 is a wasteful number, since it uses less digits than its factorization.

161544474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301 (or 291 counting only the distinct ones).

The product of its digits is 53760, while the sum is 36.

The square root of 161544474 is about 12710.0147128160. The cubic root of 161544474 is about 544.6247440642.

The spelling of 161544474 in words is "one hundred sixty-one million, five hundred forty-four thousand, four hundred seventy-four".