16664400506 has 8 divisors (see below), whose sum is σ = 26919416244. Its totient is φ = 7691261760.

The previous prime is 16664400499. The next prime is 16664400539. The reversal of 16664400506 is 60500446661.

16664400506 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 12669528481 + 3994872025 = 112559^2 + 63205^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 16664400506.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 320469215 + ... + 320469266.

Almost surely, 2^16664400506 is an apocalyptic number.

16664400506 is a deficient number, since it is larger than the sum of its proper divisors (10255015738).

16664400506 is a wasteful number, since it uses less digits than its factorization.

16664400506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 640938496.

The product of its (nonzero) digits is 103680, while the sum is 38.

The spelling of 16664400506 in words is "sixteen billion, six hundred sixty-four million, four hundred thousand, five hundred six".