42240433993 has 2 divisors, whose sum is σ = 42240433994. Its totient is φ = 42240433992.

The previous prime is 42240433973. The next prime is 42240433999. The reversal of 42240433993 is 39933404224.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34399862784 + 7840571209 = 185472^2 + 88547^2 .

It is a cyclic number.

It is not a de Polignac number, because 42240433993 - 2⁹ = 42240433481 is a prime.

It is not a weakly prime, because it can be changed into another prime (42240433999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21120216996 + 21120216997.

It is an arithmetic number, because the mean of its divisors is an integer number (21120216997).

Almost surely, 2^42240433993 is an apocalyptic number.

It is an amenable number.

42240433993 is a deficient number, since it is larger than the sum of its proper divisors (1).

42240433993 is an equidigital number, since it uses as much as digits as its factorization.

42240433993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 559872, while the sum is 43.

The spelling of 42240433993 in words is "forty-two billion, two hundred forty million, four hundred thirty-three thousand, nine hundred ninety-three".