16616769649 has 2 divisors, whose sum is σ = 16616769650. Its totient is φ = 16616769648.

The previous prime is 16616769623. The next prime is 16616769707. The reversal of 16616769649 is 94696761661.

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., 11657089024 + 4959680625 = 107968^2 + 70425^2 .

It is a cyclic number.

It is not a de Polignac number, because 16616769649 - 2¹⁹ = 16616245361 is a prime.

It is a super-2 number, since 2×16616769649² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (16616769619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8308384824 + 8308384825.

It is an arithmetic number, because the mean of its divisors is an integer number (8308384825).

Almost surely, 2^16616769649 is an apocalyptic number.

It is an amenable number.

16616769649 is a deficient number, since it is larger than the sum of its proper divisors (1).

16616769649 is an equidigital number, since it uses as much as digits as its factorization.

16616769649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17635968, while the sum is 61.

The spelling of 16616769649 in words is "sixteen billion, six hundred sixteen million, seven hundred sixty-nine thousand, six hundred forty-nine".