161582916 has 72 divisors (see below), whose sum is σ = 436303840. Its totient is φ = 46379520.

The previous prime is 161582857. The next prime is 161582917. The reversal of 161582916 is 619285161.

It is a super-2 number, since 2×161582916² = 52218077486126112, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161582917) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24660 + ... + 30516.

Almost surely, 2^161582916 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161582916, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (218151920).

161582916 is an abundant number, since it is smaller than the sum of its proper divisors (274720924).

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

161582916 is a wasteful number, since it uses less digits than its factorization.

161582916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5905 (or 5892 counting only the distinct ones).

The product of its digits is 25920, while the sum is 39.

The square root of 161582916 is about 12711.5268949092. The cubic root of 161582916 is about 544.6679412581.

The spelling of 161582916 in words is "one hundred sixty-one million, five hundred eighty-two thousand, nine hundred sixteen".