161585863 has 2 divisors, whose sum is σ = 161585864. Its totient is φ = 161585862.

The previous prime is 161585839. The next prime is 161585869. The reversal of 161585863 is 368585161.

161585863 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161585863 - 2¹³ = 161577671 is a prime.

It is a super-2 number, since 2×161585863² = 52219982242909538, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161585869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80792931 + 80792932.

It is an arithmetic number, because the mean of its divisors is an integer number (80792932).

Almost surely, 2^161585863 is an apocalyptic number.

161585863 is a deficient number, since it is larger than the sum of its proper divisors (1).

161585863 is an equidigital number, since it uses as much as digits as its factorization.

161585863 is an evil number, because the sum of its binary digits is even.

The product of its digits is 172800, while the sum is 43.

The square root of 161585863 is about 12711.6428127917. The cubic root of 161585863 is about 544.6712525130.

It can be divided in two parts, 1615 and 85863, that added together give a palindrome (87478).

The spelling of 161585863 in words is "one hundred sixty-one million, five hundred eighty-five thousand, eight hundred sixty-three".