641620442117 has 2 divisors, whose sum is σ = 641620442118. Its totient is φ = 641620442116.

The previous prime is 641620442077. The next prime is 641620442129. The reversal of 641620442117 is 711244026146.

641620442117 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., 536301370276 + 105319071841 = 732326^2 + 324529^2 .

It is a cyclic number.

It is not a de Polignac number, because 641620442117 - 2⁶ = 641620442053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (641620442137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320810221058 + 320810221059.

It is an arithmetic number, because the mean of its divisors is an integer number (320810221059).

Almost surely, 2^641620442117 is an apocalyptic number.

It is an amenable number.

641620442117 is a deficient number, since it is larger than the sum of its proper divisors (1).

641620442117 is an equidigital number, since it uses as much as digits as its factorization.

641620442117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64512, while the sum is 38.

The spelling of 641620442117 in words is "six hundred forty-one billion, six hundred twenty million, four hundred forty-two thousand, one hundred seventeen".