16699649 has 2 divisors, whose sum is σ = 16699650. Its totient is φ = 16699648.

The previous prime is 16699637. The next prime is 16699663. The reversal of 16699649 is 94699661.

It is a happy number.

16699649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14010049 + 2689600 = 3743^2 + 1640^2 .

It is a cyclic number.

It is not a de Polignac number, because 16699649 - 2⁸ = 16699393 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 16699597 and 16699606.

It is not a weakly prime, because it can be changed into another prime (16629649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8349824 + 8349825.

It is an arithmetic number, because the mean of its divisors is an integer number (8349825).

Almost surely, 2^16699649 is an apocalyptic number.

It is an amenable number.

16699649 is a deficient number, since it is larger than the sum of its proper divisors (1).

16699649 is an equidigital number, since it uses as much as digits as its factorization.

16699649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 629856, while the sum is 50.

The square root of 16699649 is about 4086.5204024940. The cubic root of 16699649 is about 255.6048642584.

The spelling of 16699649 in words is "sixteen million, six hundred ninety-nine thousand, six hundred forty-nine".