161556683 has 4 divisors (see below), whose sum is σ = 161585208. Its totient is φ = 161528160.

The previous prime is 161556679. The next prime is 161556697. The reversal of 161556683 is 386655161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 386655161 = 757 ⋅510773.

It is a cyclic number.

It is not a de Polignac number, because 161556683 - 2² = 161556679 is a prime.

It is a super-2 number, since 2×161556683² = 52201123643924978, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161556683.

It is not an unprimeable number, because it can be changed into a prime (161556653) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2573 + ... + 18158.

It is an arithmetic number, because the mean of its divisors is an integer number (40396302).

Almost surely, 2^161556683 is an apocalyptic number.

161556683 is a deficient number, since it is larger than the sum of its proper divisors (28525).

161556683 is an equidigital number, since it uses as much as digits as its factorization.

161556683 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28524.

The product of its digits is 129600, while the sum is 41.

The square root of 161556683 is about 12710.4949942951. The cubic root of 161556683 is about 544.6384640342.

The spelling of 161556683 in words is "one hundred sixty-one million, five hundred fifty-six thousand, six hundred eighty-three".