161916615825316 has 81 divisors (see below), whose sum is σ = 318890608098699. Its totient is φ = 71881525254000.

The previous prime is 161916615825311. The next prime is 161916615825353. The reversal of 161916615825316 is 613528516619161.

The square root of 161916615825316 is 12724646.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161916615825311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 12037508391 + ... + 12037521841.

Almost surely, 2^{161916615825316} is an apocalyptic number.

161916615825316 is the 12724646-th square number.

It is an amenable number.

161916615825316 is a deficient number, since it is larger than the sum of its proper divisors (156973992273383).

161916615825316 is an frugal number, since it uses more digits than its factorization.

161916615825316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27014 (or 13507 counting only the distinct ones).

The product of its digits is 13996800, while the sum is 61.

The spelling of 161916615825316 in words is "one hundred sixty-one trillion, nine hundred sixteen billion, six hundred fifteen million, eight hundred twenty-five thousand, three hundred sixteen".