161500408 has 32 divisors (see below), whose sum is σ = 321343200. Its totient is φ = 75830272.

The previous prime is 161500397. The next prime is 161500453. The reversal of 161500408 is 804005161.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76341 + ... + 78427.

It is an arithmetic number, because the mean of its divisors is an integer number (10041975).

Almost surely, 2^161500408 is an apocalyptic number.

It is an amenable number.

161500408 is a deficient number, since it is larger than the sum of its proper divisors (159842792).

161500408 is a wasteful number, since it uses less digits than its factorization.

161500408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2679 (or 2675 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 161500408 is about 12708.2810796740. The cubic root of 161500408 is about 544.5752187624.

Adding to 161500408 its reverse (804005161), we get a palindrome (965505569).

The spelling of 161500408 in words is "one hundred sixty-one million, five hundred thousand, four hundred eight".