42506885857 has 2 divisors, whose sum is σ = 42506885858. Its totient is φ = 42506885856.

The previous prime is 42506885849. The next prime is 42506885929. The reversal of 42506885857 is 75858860524.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28095123456 + 14411762401 = 167616^2 + 120049^2 .

It is a cyclic number.

It is not a de Polignac number, because 42506885857 - 2³ = 42506885849 is a prime.

It is not a weakly prime, because it can be changed into another prime (42506885657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21253442928 + 21253442929.

It is an arithmetic number, because the mean of its divisors is an integer number (21253442929).

Almost surely, 2^42506885857 is an apocalyptic number.

It is an amenable number.

42506885857 is a deficient number, since it is larger than the sum of its proper divisors (1).

42506885857 is an equidigital number, since it uses as much as digits as its factorization.

42506885857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21504000, while the sum is 58.

The spelling of 42506885857 in words is "forty-two billion, five hundred six million, eight hundred eighty-five thousand, eight hundred fifty-seven".