161603208 has 192 divisors, whose sum is σ = 513864000. Its totient is φ = 46904832.

The previous prime is 161603191. The next prime is 161603251. The reversal of 161603208 is 802306161.

It is a super-2 number, since 2×161603208² = 52231193671782528, which contains 22 as substring.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

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

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 47 ways as a sum of consecutive naturals, for example, 693460 + ... + 693692.

It is an arithmetic number, because the mean of its divisors is an integer number (2676375).

Almost surely, 2^161603208 is an apocalyptic number.

161603208 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161603208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (256932000).

161603208 is an abundant number, since it is smaller than the sum of its proper divisors (352260792).

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

161603208 is a wasteful number, since it uses less digits than its factorization.

161603208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293 (or 270 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 161603208 is about 12712.3250430439. The cubic root of 161603208 is about 544.6907405728.

Adding to 161603208 its reverse (802306161), we get a palindrome (963909369).

The spelling of 161603208 in words is "one hundred sixty-one million, six hundred three thousand, two hundred eight".