642274106813 has 2 divisors, whose sum is σ = 642274106814. Its totient is φ = 642274106812.

The previous prime is 642274106777. The next prime is 642274106857. The reversal of 642274106813 is 318601472246.

It is a happy number.

642274106813 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (642274106857) can be obtained adding 642274106813 to its sum of digits (44).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 499754266489 + 142519840324 = 706933^2 + 377518^2 .

It is a cyclic number.

It is not a de Polignac number, because 642274106813 - 2¹⁴ = 642274090429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642274106113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321137053406 + 321137053407.

It is an arithmetic number, because the mean of its divisors is an integer number (321137053407).

Almost surely, 2^642274106813 is an apocalyptic number.

It is an amenable number.

642274106813 is a deficient number, since it is larger than the sum of its proper divisors (1).

642274106813 is an equidigital number, since it uses as much as digits as its factorization.

642274106813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 387072, while the sum is 44.

The spelling of 642274106813 in words is "six hundred forty-two billion, two hundred seventy-four million, one hundred six thousand, eight hundred thirteen".