161500416 has 144 divisors (see below), whose sum is σ = 536083968. Its totient is φ = 41932800.

The previous prime is 161500397. The next prime is 161500453. The reversal of 161500416 is 614005161.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57771 + ... + 60501.

Almost surely, 2^161500416 is an apocalyptic number.

161500416 is a gapful number since it is divisible by the number (16) 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 161500416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (268041984).

161500416 is an abundant number, since it is smaller than the sum of its proper divisors (374583552).

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

161500416 is a wasteful number, since it uses less digits than its factorization.

161500416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2768 (or 2754 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 161500416 is about 12708.2813944294. The cubic root of 161500416 is about 544.5752277543.

Adding to 161500416 its reverse (614005161), we get a palindrome (775505577).

The spelling of 161500416 in words is "one hundred sixty-one million, five hundred thousand, four hundred sixteen".