161343721439 has 8 divisors (see below), whose sum is σ = 165100317120. Its totient is φ = 157600615456.

The previous prime is 161343721433. The next prime is 161343721471. The reversal of 161343721439 is 934127343161.

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

It is a cyclic number.

It is not a de Polignac number, because 161343721439 - 2⁴ = 161343721423 is a prime.

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 161343721439.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161343721433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3348224 + ... + 3396069.

It is an arithmetic number, because the mean of its divisors is an integer number (20637539640).

Almost surely, 2^161343721439 is an apocalyptic number.

161343721439 is a deficient number, since it is larger than the sum of its proper divisors (3756595681).

161343721439 is an equidigital number, since it uses as much as digits as its factorization.

161343721439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6744849.

The product of its digits is 326592, while the sum is 44.

The spelling of 161343721439 in words is "one hundred sixty-one billion, three hundred forty-three million, seven hundred twenty-one thousand, four hundred thirty-nine".