16645576506667 has 4 divisors (see below), whose sum is σ = 16645919529600. Its totient is φ = 16645233483736.

The previous prime is 16645576506659. The next prime is 16645576506677. The reversal of 16645576506667 is 76660567554661.

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

It is a cyclic number.

It is not a de Polignac number, because 16645576506667 - 2³ = 16645576506659 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16645576506596 and 16645576506605.

It is not an unprimeable number, because it can be changed into a prime (16645576506677) 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, 171438667 + ... + 171535732.

It is an arithmetic number, because the mean of its divisors is an integer number (4161479882400).

Almost surely, 2^{16645576506667} is an apocalyptic number.

16645576506667 is a deficient number, since it is larger than the sum of its proper divisors (343022933).

16645576506667 is an equidigital number, since it uses as much as digits as its factorization.

16645576506667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343022932.

The product of its (nonzero) digits is 1143072000, while the sum is 70.

The spelling of 16645576506667 in words is "sixteen trillion, six hundred forty-five billion, five hundred seventy-six million, five hundred six thousand, six hundred sixty-seven".