642304434523 has 2 divisors, whose sum is σ = 642304434524. Its totient is φ = 642304434522.

The previous prime is 642304434521. The next prime is 642304434557. The reversal of 642304434523 is 325434403246.

642304434523 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 is a cyclic number.

It is not a de Polignac number, because 642304434523 - 2¹ = 642304434521 is a prime.

Together with 642304434521, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (642304434521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321152217261 + 321152217262.

It is an arithmetic number, because the mean of its divisors is an integer number (321152217262).

Almost surely, 2^642304434523 is an apocalyptic number.

642304434523 is a deficient number, since it is larger than the sum of its proper divisors (1).

642304434523 is an equidigital number, since it uses as much as digits as its factorization.

642304434523 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 829440, while the sum is 40.

Adding to 642304434523 its reverse (325434403246), we get a palindrome (967738837769).

The spelling of 642304434523 in words is "six hundred forty-two billion, three hundred four million, four hundred thirty-four thousand, five hundred twenty-three".