16401798173 has 2 divisors, whose sum is σ = 16401798174. Its totient is φ = 16401798172.

The previous prime is 16401798121. The next prime is 16401798229. The reversal of 16401798173 is 37189710461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8394590884 + 8007207289 = 91622^2 + 89483^2 .

It is a cyclic number.

It is not a de Polignac number, because 16401798173 - 2³² = 12106830877 is a prime.

It is a super-2 number, since 2×16401798173² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16401798113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8200899086 + 8200899087.

It is an arithmetic number, because the mean of its divisors is an integer number (8200899087).

Almost surely, 2^16401798173 is an apocalyptic number.

It is an amenable number.

16401798173 is a deficient number, since it is larger than the sum of its proper divisors (1).

16401798173 is an equidigital number, since it uses as much as digits as its factorization.

16401798173 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 254016, while the sum is 47.

The spelling of 16401798173 in words is "sixteen billion, four hundred one million, seven hundred ninety-eight thousand, one hundred seventy-three".