6435890161 has 2 divisors, whose sum is σ = 6435890162. Its totient is φ = 6435890160.

The previous prime is 6435890137. The next prime is 6435890173. The reversal of 6435890161 is 1610985346.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5661659536 + 774230625 = 75244^2 + 27825^2 .

It is a cyclic number.

It is not a de Polignac number, because 6435890161 - 2¹⁷ = 6435759089 is a prime.

It is not a weakly prime, because it can be changed into another prime (6435890101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3217945080 + 3217945081.

It is an arithmetic number, because the mean of its divisors is an integer number (3217945081).

Almost surely, 2^6435890161 is an apocalyptic number.

It is an amenable number.

6435890161 is a deficient number, since it is larger than the sum of its proper divisors (1).

6435890161 is an equidigital number, since it uses as much as digits as its factorization.

6435890161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 155520, while the sum is 43.

The square root of 6435890161 is about 80223.9999065118. Note that the first 4 decimals coincide. The cubic root of 6435890161 is about 1860.0996363360.

The spelling of 6435890161 in words is "six billion, four hundred thirty-five million, eight hundred ninety thousand, one hundred sixty-one".