161318054321 has 8 divisors (see below), whose sum is σ = 170831833704. Its totient is φ = 151806995200.

The previous prime is 161318054279. The next prime is 161318054323. The reversal of 161318054321 is 123450813161.

It is a happy number.

161318054321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 27040513600 + 134277540721 = 164440^2 + 366439^2 .

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 161318054321 - 2²² = 161313860017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161318054323) 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 7 ways as a sum of consecutive naturals, for example, 557330 + ... + 795771.

It is an arithmetic number, because the mean of its divisors is an integer number (21353979213).

Almost surely, 2^161318054321 is an apocalyptic number.

It is an amenable number.

161318054321 is a deficient number, since it is larger than the sum of its proper divisors (9513779383).

161318054321 is a wasteful number, since it uses less digits than its factorization.

161318054321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1360131.

The product of its (nonzero) digits is 17280, while the sum is 35.

Adding to 161318054321 its reverse (123450813161), we get a palindrome (284768867482).

The spelling of 161318054321 in words is "one hundred sixty-one billion, three hundred eighteen million, fifty-four thousand, three hundred twenty-one".