642734112641 has 2 divisors, whose sum is σ = 642734112642. Its totient is φ = 642734112640.

The previous prime is 642734112599. The next prime is 642734112661. The reversal of 642734112641 is 146211437246.

642734112641 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 628644422641 + 14089690000 = 792871^2 + 118700^2 .

It is a cyclic number.

It is not a de Polignac number, because 642734112641 - 2⁶ = 642734112577 is a prime.

It is not a weakly prime, because it can be changed into another prime (642734112661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321367056320 + 321367056321.

It is an arithmetic number, because the mean of its divisors is an integer number (321367056321).

Almost surely, 2^642734112641 is an apocalyptic number.

It is an amenable number.

642734112641 is a deficient number, since it is larger than the sum of its proper divisors (1).

642734112641 is an equidigital number, since it uses as much as digits as its factorization.

642734112641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 193536, while the sum is 41.

Adding to 642734112641 its reverse (146211437246), we get a palindrome (788945549887).

The spelling of 642734112641 in words is "six hundred forty-two billion, seven hundred thirty-four million, one hundred twelve thousand, six hundred forty-one".