6435406009 has 2 divisors, whose sum is σ = 6435406010. Its totient is φ = 6435406008.

The previous prime is 6435405997. The next prime is 6435406063. The reversal of 6435406009 is 9006045346.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6435248400 + 157609 = 80220^2 + 397^2 .

It is a cyclic number.

It is not a de Polignac number, because 6435406009 - 2¹³ = 6435397817 is a prime.

It is not a weakly prime, because it can be changed into another prime (6435406069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3217703004 + 3217703005.

It is an arithmetic number, because the mean of its divisors is an integer number (3217703005).

Almost surely, 2^6435406009 is an apocalyptic number.

It is an amenable number.

6435406009 is a deficient number, since it is larger than the sum of its proper divisors (1).

6435406009 is an equidigital number, since it uses as much as digits as its factorization.

6435406009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 37.

The square root of 6435406009 is about 80220.9823487596. The cubic root of 6435406009 is about 1860.0529919962.

The spelling of 6435406009 in words is "six billion, four hundred thirty-five million, four hundred six thousand, nine".