16698665643 has 16 divisors (see below), whose sum is σ = 25345011456. Its totient is φ = 9680385440.

The previous prime is 16698665611. The next prime is 16698665647. The reversal of 16698665643 is 34656689661.

It is a happy number.

It is not a de Polignac number, because 16698665643 - 2⁵ = 16698665611 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16698665647) 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 in 15 ways as a sum of consecutive naturals, for example, 10999680 + ... + 11001197.

It is an arithmetic number, because the mean of its divisors is an integer number (1584063216).

Almost surely, 2^16698665643 is an apocalyptic number.

16698665643 is a deficient number, since it is larger than the sum of its proper divisors (8646345813).

16698665643 is a wasteful number, since it uses less digits than its factorization.

16698665643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22000914.

The product of its digits is 33592320, while the sum is 60.

The spelling of 16698665643 in words is "sixteen billion, six hundred ninety-eight million, six hundred sixty-five thousand, six hundred forty-three".