161600000 has 120 divisors (see below), whose sum is σ = 407575476. Its totient is φ = 64000000.

The previous prime is 161599987. The next prime is 161600003. The reversal of 161600000 is 6161.

It can be written as a sum of positive squares in 6 ways, for example, as 614656 + 160985344 = 784^2 + 12688^2 .

It is a super-2 number, since 2×161600000² = 52229120000000000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161600003) 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, 1599950 + ... + 1600050.

Almost surely, 2^161600000 is an apocalyptic number.

161600000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161600000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (203787738).

161600000 is an abundant number, since it is smaller than the sum of its proper divisors (245975476).

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

161600000 is an frugal number, since it uses more digits than its factorization.

161600000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144 (or 108 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 161600000 is about 12712.1988656566. The cubic root of 161600000 is about 544.6871363138.

Adding to 161600000 its reverse (6161), we get a palindrome (161606161).

The spelling of 161600000 in words is "one hundred sixty-one million, six hundred thousand".