16403173217 has 2 divisors, whose sum is σ = 16403173218. Its totient is φ = 16403173216.

The previous prime is 16403173201. The next prime is 16403173223. The reversal of 16403173217 is 71237130461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11951081041 + 4452092176 = 109321^2 + 66724^2 .

It is a cyclic number.

It is not a de Polignac number, because 16403173217 - 2⁴ = 16403173201 is a prime.

It is a super-2 number, since 2×16403173217² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (16403173247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8201586608 + 8201586609.

It is an arithmetic number, because the mean of its divisors is an integer number (8201586609).

Almost surely, 2^16403173217 is an apocalyptic number.

It is an amenable number.

16403173217 is a deficient number, since it is larger than the sum of its proper divisors (1).

16403173217 is an equidigital number, since it uses as much as digits as its factorization.

16403173217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21168, while the sum is 35.

The spelling of 16403173217 in words is "sixteen billion, four hundred three million, one hundred seventy-three thousand, two hundred seventeen".