161610516 has 36 divisors (see below), whose sum is σ = 408923424. Its totient is φ = 53816400.

The previous prime is 161610511. The next prime is 161610557. The reversal of 161610516 is 615016161.

161610516 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×161610516² = 52235917763572512, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 161610516.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161610511) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 52911 + ... + 55881.

It is an arithmetic number, because the mean of its divisors is an integer number (11358984).

Almost surely, 2^161610516 is an apocalyptic number.

It is an amenable number.

161610516 is an abundant number, since it is smaller than the sum of its proper divisors (247312908).

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

161610516 is a wasteful number, since it uses less digits than its factorization.

161610516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4492 (or 4487 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 161610516 is about 12712.6124773785. The cubic root of 161610516 is about 544.6989510945.

Adding to 161610516 its reverse (615016161), we get a palindrome (776626677).

The spelling of 161610516 in words is "one hundred sixty-one million, six hundred ten thousand, five hundred sixteen".