161966447 has 4 divisors (see below), whose sum is σ = 162021216. Its totient is φ = 161911680.

The previous prime is 161966443. The next prime is 161966459. The reversal of 161966447 is 744669161.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 161966447 - 2² = 161966443 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 161966398 and 161966407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161966443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22679 + ... + 28952.

It is an arithmetic number, because the mean of its divisors is an integer number (40505304).

Almost surely, 2^161966447 is an apocalyptic number.

161966447 is a deficient number, since it is larger than the sum of its proper divisors (54769).

161966447 is an equidigital number, since it uses as much as digits as its factorization.

161966447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54768.

The product of its digits is 217728, while the sum is 44.

The square root of 161966447 is about 12726.6039067773. The cubic root of 161966447 is about 545.0985395428.

The spelling of 161966447 in words is "one hundred sixty-one million, nine hundred sixty-six thousand, four hundred forty-seven".