216064454449 has 2 divisors, whose sum is σ = 216064454450. Its totient is φ = 216064454448.

The previous prime is 216064454371. The next prime is 216064454461. The reversal of 216064454449 is 944454460612.

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., 182623749025 + 33440705424 = 427345^2 + 182868^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216064454449 is a prime.

It is not a weakly prime, because it can be changed into another prime (216064457449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108032227224 + 108032227225.

It is an arithmetic number, because the mean of its divisors is an integer number (108032227225).

Almost surely, 2^216064454449 is an apocalyptic number.

It is an amenable number.

216064454449 is a deficient number, since it is larger than the sum of its proper divisors (1).

216064454449 is an equidigital number, since it uses as much as digits as its factorization.

216064454449 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3317760, while the sum is 49.

The spelling of 216064454449 in words is "two hundred sixteen billion, sixty-four million, four hundred fifty-four thousand, four hundred forty-nine".