161327681 has 8 divisors (see below), whose sum is σ = 170372160. Its totient is φ = 152452432.

The previous prime is 161327633. The next prime is 161327687. The reversal of 161327681 is 186723161.

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 161327681 - 2¹⁰ = 161326657 is a prime.

It is a super-2 number, since 2×161327681² = 52053241313675522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161327687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40346 + ... + 44163.

It is an arithmetic number, because the mean of its divisors is an integer number (21296520).

Almost surely, 2^161327681 is an apocalyptic number.

It is an amenable number.

161327681 is a deficient number, since it is larger than the sum of its proper divisors (9044479).

161327681 is an equidigital number, since it uses as much as digits as its factorization.

161327681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84615.

The product of its digits is 12096, while the sum is 35.

The square root of 161327681 is about 12701.4834173021. The cubic root of 161327681 is about 544.3810058421.

The spelling of 161327681 in words is "one hundred sixty-one million, three hundred twenty-seven thousand, six hundred eighty-one".