16664170538 has 8 divisors (see below), whose sum is σ = 25085211300. Its totient is φ = 8302433440.

The previous prime is 16664170531. The next prime is 16664170603. The reversal of 16664170538 is 83507146661.

It can be written as a sum of positive squares in 2 ways, for example, as 16653128209 + 11042329 = 129047^2 + 3323^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 16664170492 and 16664170501.

It is not an unprimeable number, because it can be changed into a prime (16664170531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14825213 + ... + 14826336.

Almost surely, 2^16664170538 is an apocalyptic number.

16664170538 is a deficient number, since it is larger than the sum of its proper divisors (8421040762).

16664170538 is a wasteful number, since it uses less digits than its factorization.

16664170538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29651832.

The product of its (nonzero) digits is 725760, while the sum is 47.

The spelling of 16664170538 in words is "sixteen billion, six hundred sixty-four million, one hundred seventy thousand, five hundred thirty-eight".