16667601689 has 4 divisors (see below), whose sum is σ = 16677785124. Its totient is φ = 16657418256.

The previous prime is 16667601683. The next prime is 16667601697. The reversal of 16667601689 is 98610676661.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3350441689 + 13317160000 = 57883^2 + 115400^2 .

It is a cyclic number.

It is not a de Polignac number, because 16667601689 - 2¹⁶ = 16667536153 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16667601683) 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, 5089262 + ... + 5092535.

It is an arithmetic number, because the mean of its divisors is an integer number (4169446281).

Almost surely, 2^16667601689 is an apocalyptic number.

It is an amenable number.

16667601689 is a deficient number, since it is larger than the sum of its proper divisors (10183435).

16667601689 is a wasteful number, since it uses less digits than its factorization.

16667601689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10183434.

The product of its (nonzero) digits is 3919104, while the sum is 56.

The spelling of 16667601689 in words is "sixteen billion, six hundred sixty-seven million, six hundred one thousand, six hundred eighty-nine".