161586307061 has 2 divisors, whose sum is σ = 161586307062. Its totient is φ = 161586307060.

The previous prime is 161586307039. The next prime is 161586307087. The reversal of 161586307061 is 160703685161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 161508338161 + 77968900 = 401881^2 + 8830^2 .

It is a cyclic number.

It is not a de Polignac number, because 161586307061 - 2⁶ = 161586306997 is a prime.

It is a super-2 number, since 2×161586307061² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161586307261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80793153530 + 80793153531.

It is an arithmetic number, because the mean of its divisors is an integer number (80793153531).

Almost surely, 2^161586307061 is an apocalyptic number.

It is an amenable number.

161586307061 is a deficient number, since it is larger than the sum of its proper divisors (1).

161586307061 is an equidigital number, since it uses as much as digits as its factorization.

161586307061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 181440, while the sum is 44.

The spelling of 161586307061 in words is "one hundred sixty-one billion, five hundred eighty-six million, three hundred seven thousand, sixty-one".