168887590561 has 4 divisors (see below), whose sum is σ = 169497293332. Its totient is φ = 168277887792.

The previous prime is 168887590559. The next prime is 168887590673. The reversal of 168887590561 is 165095788861.

It is a happy number.

168887590561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 165095788861 = 907 ⋅182024023.

It can be written as a sum of positive squares in 2 ways, for example, as 109449150561 + 59438440000 = 330831^2 + 243800^2 .

It is a cyclic number.

It is not a de Polignac number, because 168887590561 - 2¹ = 168887590559 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 168887590493 and 168887590502.

It is not an unprimeable number, because it can be changed into a prime (168887590541) 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 3 ways as a sum of consecutive naturals, for example, 304850970 + ... + 304851523.

It is an arithmetic number, because the mean of its divisors is an integer number (42374323333).

Almost surely, 2^168887590561 is an apocalyptic number.

It is an amenable number.

168887590561 is a deficient number, since it is larger than the sum of its proper divisors (609702771).

168887590561 is an equidigital number, since it uses as much as digits as its factorization.

168887590561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 609702770.

The product of its (nonzero) digits is 29030400, while the sum is 64.

The spelling of 168887590561 in words is "one hundred sixty-eight billion, eight hundred eighty-seven million, five hundred ninety thousand, five hundred sixty-one".