642042240263 has 2 divisors, whose sum is σ = 642042240264. Its totient is φ = 642042240262.

The previous prime is 642042240239. The next prime is 642042240269. The reversal of 642042240263 is 362042240246.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 642042240263 - 2³⁰ = 640968498439 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642042240269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321021120131 + 321021120132.

It is an arithmetic number, because the mean of its divisors is an integer number (321021120132).

Almost surely, 2^642042240263 is an apocalyptic number.

642042240263 is a deficient number, since it is larger than the sum of its proper divisors (1).

642042240263 is an equidigital number, since it uses as much as digits as its factorization.

642042240263 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 110592, while the sum is 35.

The spelling of 642042240263 in words is "six hundred forty-two billion, forty-two million, two hundred forty thousand, two hundred sixty-three".