16661172206441 has 16 divisors (see below), whose sum is σ = 20075896012800. Its totient is φ = 13507516030608.

The previous prime is 16661172206411. The next prime is 16661172206453. The reversal of 16661172206441 is 14460227116661.

It is a cyclic number.

It is not a de Polignac number, because 16661172206441 - 2¹⁰ = 16661172205417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16661172206411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 101106665 + ... + 101271318.

It is an arithmetic number, because the mean of its divisors is an integer number (1254743500800).

Almost surely, 2^{16661172206441} is an apocalyptic number.

It is an amenable number.

16661172206441 is a deficient number, since it is larger than the sum of its proper divisors (3414723806359).

16661172206441 is a wasteful number, since it uses less digits than its factorization.

16661172206441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202378628.

The product of its (nonzero) digits is 580608, while the sum is 47.

The spelling of 16661172206441 in words is "sixteen trillion, six hundred sixty-one billion, one hundred seventy-two million, two hundred six thousand, four hundred forty-one".