642768766141 has 2 divisors, whose sum is σ = 642768766142. Its totient is φ = 642768766140.

The previous prime is 642768766127. The next prime is 642768766151. The reversal of 642768766141 is 141667867246.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 404457840900 + 238310925241 = 635970^2 + 488171^2 .

It is a cyclic number.

It is not a de Polignac number, because 642768766141 - 2¹¹ = 642768764093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642768766151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321384383070 + 321384383071.

It is an arithmetic number, because the mean of its divisors is an integer number (321384383071).

Almost surely, 2^642768766141 is an apocalyptic number.

It is an amenable number.

642768766141 is a deficient number, since it is larger than the sum of its proper divisors (1).

642768766141 is an equidigital number, since it uses as much as digits as its factorization.

642768766141 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16257024, while the sum is 58.

The spelling of 642768766141 in words is "six hundred forty-two billion, seven hundred sixty-eight million, seven hundred sixty-six thousand, one hundred forty-one".