16947880217 has 2 divisors, whose sum is σ = 16947880218. Its totient is φ = 16947880216.

The previous prime is 16947880181. The next prime is 16947880237. The reversal of 16947880217 is 71208874961.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14110826521 + 2837053696 = 118789^2 + 53264^2 .

It is a cyclic number.

It is not a de Polignac number, because 16947880217 - 2⁶ = 16947880153 is a prime.

It is not a weakly prime, because it can be changed into another prime (16947880237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8473940108 + 8473940109.

It is an arithmetic number, because the mean of its divisors is an integer number (8473940109).

Almost surely, 2^16947880217 is an apocalyptic number.

It is an amenable number.

16947880217 is a deficient number, since it is larger than the sum of its proper divisors (1).

16947880217 is an equidigital number, since it uses as much as digits as its factorization.

16947880217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1354752, while the sum is 53.

The spelling of 16947880217 in words is "sixteen billion, nine hundred forty-seven million, eight hundred eighty thousand, two hundred seventeen".