16420244081 has 2 divisors, whose sum is σ = 16420244082. Its totient is φ = 16420244080.

The previous prime is 16420244051. The next prime is 16420244101. The reversal of 16420244081 is 18044202461.

16420244081 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 can be written as a sum of positive squares in only one way, i.e., 16037689600 + 382554481 = 126640^2 + 19559^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16420244081 is a prime.

It is a super-2 number, since 2×16420244081² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (16420244051) 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, 8210122040 + 8210122041.

It is an arithmetic number, because the mean of its divisors is an integer number (8210122041).

Almost surely, 2^16420244081 is an apocalyptic number.

It is an amenable number.

16420244081 is a deficient number, since it is larger than the sum of its proper divisors (1).

16420244081 is an equidigital number, since it uses as much as digits as its factorization.

16420244081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12288, while the sum is 32.

The spelling of 16420244081 in words is "sixteen billion, four hundred twenty million, two hundred forty-four thousand, eighty-one".