642268688687 has 2 divisors, whose sum is σ = 642268688688. Its totient is φ = 642268688686.

The previous prime is 642268688603. The next prime is 642268688701. The reversal of 642268688687 is 786886862246.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-642268688687 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 642268688687.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642268688587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321134344343 + 321134344344.

It is an arithmetic number, because the mean of its divisors is an integer number (321134344344).

Almost surely, 2^642268688687 is an apocalyptic number.

642268688687 is a deficient number, since it is larger than the sum of its proper divisors (1).

642268688687 is an equidigital number, since it uses as much as digits as its factorization.

642268688687 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 594542592, while the sum is 71.

The spelling of 642268688687 in words is "six hundred forty-two billion, two hundred sixty-eight million, six hundred eighty-eight thousand, six hundred eighty-seven".