161728487267 has 4 divisors (see below), whose sum is σ = 162101994600. Its totient is φ = 161354979936.

The previous prime is 161728487203. The next prime is 161728487309. The reversal of 161728487267 is 762784827161.

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 161728487267 - 2⁶ = 161728487203 is a prime.

It is a super-2 number, since 2×161728487267² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161728487567) 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, 186753017 + ... + 186753882.

It is an arithmetic number, because the mean of its divisors is an integer number (40525498650).

Almost surely, 2^161728487267 is an apocalyptic number.

161728487267 is a deficient number, since it is larger than the sum of its proper divisors (373507333).

161728487267 is an equidigital number, since it uses as much as digits as its factorization.

161728487267 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373507332.

The product of its digits is 12644352, while the sum is 59.

The spelling of 161728487267 in words is "one hundred sixty-one billion, seven hundred twenty-eight million, four hundred eighty-seven thousand, two hundred sixty-seven".