42395909797 has 2 divisors, whose sum is σ = 42395909798. Its totient is φ = 42395909796.

The previous prime is 42395909779. The next prime is 42395909849. The reversal of 42395909797 is 79790959324.

Together with previous prime (42395909779) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37748215521 + 4647694276 = 194289^2 + 68174^2 .

It is a cyclic number.

It is not a de Polignac number, because 42395909797 - 2⁷ = 42395909669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42395909197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21197954898 + 21197954899.

It is an arithmetic number, because the mean of its divisors is an integer number (21197954899).

Almost surely, 2^42395909797 is an apocalyptic number.

It is an amenable number.

42395909797 is a deficient number, since it is larger than the sum of its proper divisors (1).

42395909797 is an equidigital number, since it uses as much as digits as its factorization.

42395909797 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38578680, while the sum is 64.

The spelling of 42395909797 in words is "forty-two billion, three hundred ninety-five million, nine hundred nine thousand, seven hundred ninety-seven".