42405444509 has 2 divisors, whose sum is σ = 42405444510. Its totient is φ = 42405444508.

The previous prime is 42405444469. The next prime is 42405444539. The reversal of 42405444509 is 90544450424.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29979883609 + 12425560900 = 173147^2 + 111470^2 .

It is a cyclic number.

It is not a de Polignac number, because 42405444509 - 2²⁸ = 42137009053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42405444539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21202722254 + 21202722255.

It is an arithmetic number, because the mean of its divisors is an integer number (21202722255).

Almost surely, 2^42405444509 is an apocalyptic number.

It is an amenable number.

42405444509 is a deficient number, since it is larger than the sum of its proper divisors (1).

42405444509 is an equidigital number, since it uses as much as digits as its factorization.

42405444509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 460800, while the sum is 41.

The spelling of 42405444509 in words is "forty-two billion, four hundred five million, four hundred forty-four thousand, five hundred nine".