642520336439 has 2 divisors, whose sum is σ = 642520336440. Its totient is φ = 642520336438.

The previous prime is 642520336433. The next prime is 642520336511. The reversal of 642520336439 is 934633025246.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 642520336439 - 2³² = 638225369143 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 642520336393 and 642520336402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642520336433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321260168219 + 321260168220.

It is an arithmetic number, because the mean of its divisors is an integer number (321260168220).

Almost surely, 2^642520336439 is an apocalyptic number.

642520336439 is a deficient number, since it is larger than the sum of its proper divisors (1).

642520336439 is an equidigital number, since it uses as much as digits as its factorization.

642520336439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2799360, while the sum is 47.

The spelling of 642520336439 in words is "six hundred forty-two billion, five hundred twenty million, three hundred thirty-six thousand, four hundred thirty-nine".