161600616 has 64 divisors (see below), whose sum is σ = 450000000. Its totient is φ = 53733888.

The previous prime is 161600609. The next prime is 161600627. The reversal of 161600616 is 616006161.

It is a super-2 number, since 2×161600616² = 52229518183158912, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 161600616.

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, 128760 + ... + 130008.

It is an arithmetic number, because the mean of its divisors is an integer number (7031250).

Almost surely, 2^161600616 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 161600616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (225000000).

161600616 is an abundant number, since it is smaller than the sum of its proper divisors (288399384).

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

161600616 is a wasteful number, since it uses less digits than its factorization.

161600616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1863 (or 1853 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 161600616 is about 12712.2230943293. The cubic root of 161600616 is about 544.6878284071.

Adding to 161600616 its reverse (616006161), we get a palindrome (777606777).

The spelling of 161600616 in words is "one hundred sixty-one million, six hundred thousand, six hundred sixteen".