642306603209 has 2 divisors, whose sum is σ = 642306603210. Its totient is φ = 642306603208.

The previous prime is 642306603199. The next prime is 642306603313. The reversal of 642306603209 is 902306603246.

642306603209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 388693643209 + 253612960000 = 623453^2 + 503600^2 .

It is a cyclic number.

It is not a de Polignac number, because 642306603209 - 2²⁸ = 642038167753 is a prime.

It is not a weakly prime, because it can be changed into another prime (642306600209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321153301604 + 321153301605.

It is an arithmetic number, because the mean of its divisors is an integer number (321153301605).

Almost surely, 2^642306603209 is an apocalyptic number.

It is an amenable number.

642306603209 is a deficient number, since it is larger than the sum of its proper divisors (1).

642306603209 is an equidigital number, since it uses as much as digits as its factorization.

642306603209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 279936, while the sum is 41.

The spelling of 642306603209 in words is "six hundred forty-two billion, three hundred six million, six hundred three thousand, two hundred nine".