161605516 has 24 divisors (see below), whose sum is σ = 293706000. Its totient is φ = 77711424.

The previous prime is 161605513. The next prime is 161605517. The reversal of 161605516 is 615506161.

161605516 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×161605516² = 52232685603252512, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161605513) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28615 + ... + 33793.

It is an arithmetic number, because the mean of its divisors is an integer number (12237750).

Almost surely, 2^161605516 is an apocalyptic number.

It is an amenable number.

161605516 is a deficient number, since it is larger than the sum of its proper divisors (132100484).

161605516 is a wasteful number, since it uses less digits than its factorization.

161605516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5481 (or 5479 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 161605516 is about 12712.4158207636. The cubic root of 161605516 is about 544.6933336324.

The spelling of 161605516 in words is "one hundred sixty-one million, six hundred five thousand, five hundred sixteen".