161600160004 has 12 divisors (see below), whose sum is σ = 290443531084. Its totient is φ = 78616293984.

The previous prime is 161600159993. The next prime is 161600160049. The reversal of 161600160004 is 400061006161.

It can be written as a sum of positive squares in 2 ways, for example, as 153156387904 + 8443772100 = 391352^2 + 91890^2 .

It is a super-2 number, since 2×161600160004² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 545946339 + ... + 545946634.

Almost surely, 2^161600160004 is an apocalyptic number.

It is an amenable number.

161600160004 is a deficient number, since it is larger than the sum of its proper divisors (128843371080).

161600160004 is a wasteful number, since it uses less digits than its factorization.

161600160004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1091893014 (or 1091893012 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

Adding to 161600160004 its reverse (400061006161), we get a palindrome (561661166165).

It can be divided in two parts, 16 and 1600160004, that multiplied together give a square (25602560064 = 160008²).

The spelling of 161600160004 in words is "one hundred sixty-one billion, six hundred million, one hundred sixty thousand, four".