642286501009 has 2 divisors, whose sum is σ = 642286501010. Its totient is φ = 642286501008.

The previous prime is 642286501001. The next prime is 642286501013. The reversal of 642286501009 is 900105682246.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 604008752400 + 38277748609 = 777180^2 + 195647^2 .

It is a cyclic number.

It is not a de Polignac number, because 642286501009 - 2³ = 642286501001 is a prime.

It is not a weakly prime, because it can be changed into another prime (642286501001) 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, 321143250504 + 321143250505.

It is an arithmetic number, because the mean of its divisors is an integer number (321143250505).

Almost surely, 2^642286501009 is an apocalyptic number.

It is an amenable number.

642286501009 is a deficient number, since it is larger than the sum of its proper divisors (1).

642286501009 is an equidigital number, since it uses as much as digits as its factorization.

642286501009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 207360, while the sum is 43.

The spelling of 642286501009 in words is "six hundred forty-two billion, two hundred eighty-six million, five hundred one thousand, nine".