42451899705871 has 2 divisors, whose sum is σ = 42451899705872. Its totient is φ = 42451899705870.

The previous prime is 42451899705829. The next prime is 42451899705899. The reversal of 42451899705871 is 17850799815424.

42451899705871 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42451899705871 - 2⁹ = 42451899705359 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42451899705871.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42451899705571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21225949852935 + 21225949852936.

It is an arithmetic number, because the mean of its divisors is an integer number (21225949852936).

Almost surely, 2^{42451899705871} is an apocalyptic number.

42451899705871 is a deficient number, since it is larger than the sum of its proper divisors (1).

42451899705871 is an equidigital number, since it uses as much as digits as its factorization.

42451899705871 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 203212800, while the sum is 70.

The spelling of 42451899705871 in words is "forty-two trillion, four hundred fifty-one billion, eight hundred ninety-nine million, seven hundred five thousand, eight hundred seventy-one".