42506885849 has 2 divisors, whose sum is σ = 42506885850. Its totient is φ = 42506885848.

The previous prime is 42506885791. The next prime is 42506885857. The reversal of 42506885849 is 94858860524.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25302628624 + 17204257225 = 159068^2 + 131165^2 .

It is a cyclic number.

It is not a de Polignac number, because 42506885849 - 2¹⁶ = 42506820313 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (42506881849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21253442924 + 21253442925.

It is an arithmetic number, because the mean of its divisors is an integer number (21253442925).

Almost surely, 2^42506885849 is an apocalyptic number.

It is an amenable number.

42506885849 is a deficient number, since it is larger than the sum of its proper divisors (1).

42506885849 is an equidigital number, since it uses as much as digits as its factorization.

42506885849 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22118400, while the sum is 59.

The spelling of 42506885849 in words is "forty-two billion, five hundred six million, eight hundred eighty-five thousand, eight hundred forty-nine".