42506885791 has 2 divisors, whose sum is σ = 42506885792. Its totient is φ = 42506885790.

The previous prime is 42506885783. The next prime is 42506885849. The reversal of 42506885791 is 19758860524.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42506885791 - 2³ = 42506885783 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42506880791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21253442895 + 21253442896.

It is an arithmetic number, because the mean of its divisors is an integer number (21253442896).

Almost surely, 2^42506885791 is an apocalyptic number.

42506885791 is a deficient number, since it is larger than the sum of its proper divisors (1).

42506885791 is an equidigital number, since it uses as much as digits as its factorization.

42506885791 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4838400, while the sum is 55.

The spelling of 42506885791 in words is "forty-two billion, five hundred six million, eight hundred eighty-five thousand, seven hundred ninety-one".