161558403 has 8 divisors (see below), whose sum is σ = 215499600. Its totient is φ = 107661408.

The previous prime is 161558401. The next prime is 161558413. The reversal of 161558403 is 304855161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 161558403 - 2¹ = 161558401 is a prime.

It is a super-2 number, since 2×161558403² = 52202235159820818, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161558401) by changing a digit.

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, 1288 + ... + 18021.

It is an arithmetic number, because the mean of its divisors is an integer number (26937450).

Almost surely, 2^161558403 is an apocalyptic number.

161558403 is a deficient number, since it is larger than the sum of its proper divisors (53941197).

161558403 is a wasteful number, since it uses less digits than its factorization.

161558403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22101.

The product of its (nonzero) digits is 14400, while the sum is 33.

The square root of 161558403 is about 12710.5626547372. The cubic root of 161558403 is about 544.6403968436.

The spelling of 161558403 in words is "one hundred sixty-one million, five hundred fifty-eight thousand, four hundred three".