16641605406 has 8 divisors (see below), whose sum is σ = 33283210824. Its totient is φ = 5547201800.

The previous prime is 16641605363. The next prime is 16641605419. The reversal of 16641605406 is 60450614661.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

16641605406 is an admirable number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1386800445 + ... + 1386800456.

It is an arithmetic number, because the mean of its divisors is an integer number (4160401353).

Almost surely, 2^16641605406 is an apocalyptic number.

16641605406 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16641605406 is a wasteful number, since it uses less digits than its factorization.

16641605406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2773600906.

The product of its (nonzero) digits is 103680, while the sum is 39.

The spelling of 16641605406 in words is "sixteen billion, six hundred forty-one million, six hundred five thousand, four hundred six".