450643718891 has 2 divisors, whose sum is σ = 450643718892. Its totient is φ = 450643718890.

The previous prime is 450643718869. The next prime is 450643718893. The reversal of 450643718891 is 198817346054.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 450643718891 - 2¹⁴ = 450643702507 is a prime.

It is a super-2 number, since 2×450643718891² (a number of 24 digits) contains 22 as substring.

It is a Sophie Germain prime.

Together with 450643718893, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (450643718893) 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, 225321859445 + 225321859446.

It is an arithmetic number, because the mean of its divisors is an integer number (225321859446).

Almost surely, 2^450643718891 is an apocalyptic number.

450643718891 is a deficient number, since it is larger than the sum of its proper divisors (1).

450643718891 is an equidigital number, since it uses as much as digits as its factorization.

450643718891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5806080, while the sum is 56.

The spelling of 450643718891 in words is "four hundred fifty billion, six hundred forty-three million, seven hundred eighteen thousand, eight hundred ninety-one".