161019016 has 16 divisors (see below), whose sum is σ = 306860940. Its totient is φ = 79189440.

The previous prime is 161019007. The next prime is 161019017. The reversal of 161019016 is 610910161.

It can be written as a sum of positive squares in 2 ways, for example, as 125664100 + 35354916 = 11210^2 + 5946^2 .

It is not an unprimeable number, because it can be changed into a prime (161019017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 164491 + ... + 165466.

Almost surely, 2^161019016 is an apocalyptic number.

It is an amenable number.

161019016 is a deficient number, since it is larger than the sum of its proper divisors (145841924).

161019016 is a wasteful number, since it uses less digits than its factorization.

161019016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330024 (or 330020 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 25.

The square root of 161019016 is about 12689.3268536987. The cubic root of 161019016 is about 544.0335997846.

Adding to 161019016 its reverse (610910161), we get a palindrome (771929177).

The spelling of 161019016 in words is "one hundred sixty-one million, nineteen thousand, sixteen".