16804706689 has 4 divisors (see below), whose sum is σ = 16958878420. Its totient is φ = 16650534960.

The previous prime is 16804706671. The next prime is 16804706717. The reversal of 16804706689 is 98660740861.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98660740861 = 15137 ⋅6517853.

It can be written as a sum of positive squares in 2 ways, for example, as 10499076225 + 6305630464 = 102465^2 + 79408^2 .

It is a cyclic number.

It is not a de Polignac number, because 16804706689 - 2¹⁷ = 16804575617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16804706629) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77085702 + ... + 77085919.

It is an arithmetic number, because the mean of its divisors is an integer number (4239719605).

Almost surely, 2^16804706689 is an apocalyptic number.

It is an amenable number.

16804706689 is a deficient number, since it is larger than the sum of its proper divisors (154171731).

16804706689 is a wasteful number, since it uses less digits than its factorization.

16804706689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154171730.

The product of its (nonzero) digits is 3483648, while the sum is 55.

The spelling of 16804706689 in words is "sixteen billion, eight hundred four million, seven hundred six thousand, six hundred eighty-nine".