16212681649 has 2 divisors, whose sum is σ = 16212681650. Its totient is φ = 16212681648.

The previous prime is 16212681613. The next prime is 16212681689. The reversal of 16212681649 is 94618621261.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15390139249 + 822542400 = 124057^2 + 28680^2 .

It is an emirp because it is prime and its reverse (94618621261) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16212681649 - 2⁷ = 16212681521 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16212681599 and 16212681608.

It is not a weakly prime, because it can be changed into another prime (16212681689) 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, 8106340824 + 8106340825.

It is an arithmetic number, because the mean of its divisors is an integer number (8106340825).

Almost surely, 2^16212681649 is an apocalyptic number.

It is an amenable number.

16212681649 is a deficient number, since it is larger than the sum of its proper divisors (1).

16212681649 is an equidigital number, since it uses as much as digits as its factorization.

16212681649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 248832, while the sum is 46.

The spelling of 16212681649 in words is "sixteen billion, two hundred twelve million, six hundred eighty-one thousand, six hundred forty-nine".