42254864849 has 2 divisors, whose sum is σ = 42254864850. Its totient is φ = 42254864848.

The previous prime is 42254864843. The next prime is 42254864887. The reversal of 42254864849 is 94846845224.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41363424400 + 891440449 = 203380^2 + 29857^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42254864849 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42254864794 and 42254864803.

It is not a weakly prime, because it can be changed into another prime (42254864843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21127432424 + 21127432425.

It is an arithmetic number, because the mean of its divisors is an integer number (21127432425).

Almost surely, 2^42254864849 is an apocalyptic number.

It is an amenable number.

42254864849 is a deficient number, since it is larger than the sum of its proper divisors (1).

42254864849 is an equidigital number, since it uses as much as digits as its factorization.

42254864849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17694720, while the sum is 56.

The spelling of 42254864849 in words is "forty-two billion, two hundred fifty-four million, eight hundred sixty-four thousand, eight hundred forty-nine".