161841721684413 has 8 divisors (see below), whose sum is σ = 219326486217376. Its totient is φ = 106125719137200.

The previous prime is 161841721684411. The next prime is 161841721684421. The reversal of 161841721684413 is 314486127148161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 161841721684413 - 2¹ = 161841721684411 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161841721684411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 442190496223 + ... + 442190496588.

It is an arithmetic number, because the mean of its divisors is an integer number (27415810777172).

Almost surely, 2^{161841721684413} is an apocalyptic number.

It is an amenable number.

161841721684413 is a deficient number, since it is larger than the sum of its proper divisors (57484764532963).

161841721684413 is an equidigital number, since it uses as much as digits as its factorization.

161841721684413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 884380992875.

The product of its digits is 6193152, while the sum is 57.

The spelling of 161841721684413 in words is "one hundred sixty-one trillion, eight hundred forty-one billion, seven hundred twenty-one million, six hundred eighty-four thousand, four hundred thirteen".