161556716 has 18 divisors (see below), whose sum is σ = 285992700. Its totient is φ = 79855072.

The previous prime is 161556697. The next prime is 161556721. The reversal of 161556716 is 617655161.

It is a super-3 number, since 3×161556716³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 161556716.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 29135 + ... + 34233.

Almost surely, 2^161556716 is an apocalyptic number.

It is an amenable number.

161556716 is a deficient number, since it is larger than the sum of its proper divisors (124435984).

161556716 is an equidigital number, since it uses as much as digits as its factorization.

161556716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5281 (or 5190 counting only the distinct ones).

The product of its digits is 37800, while the sum is 38.

The square root of 161556716 is about 12710.4962924348. The cubic root of 161556716 is about 544.6385011173.

The spelling of 161556716 in words is "one hundred sixty-one million, five hundred fifty-six thousand, seven hundred sixteen".