16840464217 has 2 divisors, whose sum is σ = 16840464218. Its totient is φ = 16840464216.

The previous prime is 16840464131. The next prime is 16840464257. The reversal of 16840464217 is 71246404861.

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., 14080432921 + 2760031296 = 118661^2 + 52536^2 .

It is a cyclic number.

It is not a de Polignac number, because 16840464217 - 2⁷ = 16840464089 is a prime.

It is not a weakly prime, because it can be changed into another prime (16840464257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8420232108 + 8420232109.

It is an arithmetic number, because the mean of its divisors is an integer number (8420232109).

Almost surely, 2^16840464217 is an apocalyptic number.

It is an amenable number.

16840464217 is a deficient number, since it is larger than the sum of its proper divisors (1).

16840464217 is an equidigital number, since it uses as much as digits as its factorization.

16840464217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 258048, while the sum is 43.

The spelling of 16840464217 in words is "sixteen billion, eight hundred forty million, four hundred sixty-four thousand, two hundred seventeen".