642042240239 has 2 divisors, whose sum is σ = 642042240240. Its totient is φ = 642042240238.

The previous prime is 642042240167. The next prime is 642042240263. The reversal of 642042240239 is 932042240246.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 642042240239 - 2²⁰ = 642041191663 is a prime.

It is a super-2 number, since 2×642042240239² (a number of 24 digits) contains 22 as substring.

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, 321021120119 + 321021120120.

It is an arithmetic number, because the mean of its divisors is an integer number (321021120120).

Almost surely, 2^642042240239 is an apocalyptic number.

642042240239 is a deficient number, since it is larger than the sum of its proper divisors (1).

642042240239 is an equidigital number, since it uses as much as digits as its factorization.

642042240239 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 165888, while the sum is 38.

The spelling of 642042240239 in words is "six hundred forty-two billion, forty-two million, two hundred forty thousand, two hundred thirty-nine".