161540163 has 20 divisors (see below), whose sum is σ = 249101248. Its totient is φ = 104217840.

The previous prime is 161540129. The next prime is 161540189. The reversal of 161540163 is 361045161.

161540163 is a `hidden beast` number, since 1 + 61 + 540 + 1 + 63 = 666.

It is not a de Polignac number, because 161540163 - 2¹³ = 161531971 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161540263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 29656 + ... + 34677.

Almost surely, 2^161540163 is an apocalyptic number.

161540163 is a deficient number, since it is larger than the sum of its proper divisors (87561085).

161540163 is an equidigital number, since it uses as much as digits as its factorization.

161540163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64376 (or 64367 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 161540163 is about 12709.8451210076. The cubic root of 161540163 is about 544.6198993753.

The spelling of 161540163 in words is "one hundred sixty-one million, five hundred forty thousand, one hundred sixty-three".