161728432479 has 12 divisors (see below), whose sum is σ = 241143469632. Its totient is φ = 104340924000.

The previous prime is 161728432457. The next prime is 161728432487. The reversal of 161728432479 is 974234827161.

161728432479 is a `hidden beast` number, since 1 + 6 + 172 + 84 + 324 + 79 = 666.

161728432479 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 161728432479 - 2¹¹ = 161728430431 is a prime.

It is a super-2 number, since 2×161728432479² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161728432499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 289835622 + ... + 289836179.

It is an arithmetic number, because the mean of its divisors is an integer number (20095289136).

Almost surely, 2^161728432479 is an apocalyptic number.

161728432479 is a deficient number, since it is larger than the sum of its proper divisors (79415037153).

161728432479 is a wasteful number, since it uses less digits than its factorization.

161728432479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 579671838 (or 579671835 counting only the distinct ones).

The product of its digits is 4064256, while the sum is 54.

The spelling of 161728432479 in words is "one hundred sixty-one billion, seven hundred twenty-eight million, four hundred thirty-two thousand, four hundred seventy-nine".