16666222266661 has 8 divisors (see below), whose sum is σ = 18181676114784. Its totient is φ = 15150825540720.

The previous prime is 16666222266607. The next prime is 16666222266709.

16666222266661 is nontrivially palindromic in base 10.

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

It is a cyclic number.

It is not a de Polignac number, because 16666222266661 - 2⁹ = 16666222266149 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16666222266596 and 16666222266605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16666222266461) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13669350 + ... + 14838583.

It is an arithmetic number, because the mean of its divisors is an integer number (2272709514348).

Almost surely, 2^{16666222266661} is an apocalyptic number.

16666222266661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16666222266661 is a deficient number, since it is larger than the sum of its proper divisors (1515453848123).

16666222266661 is a wasteful number, since it uses less digits than its factorization.

16666222266661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28561091.

The product of its digits is 26873856, while the sum is 58.

The spelling of 16666222266661 in words is "sixteen trillion, six hundred sixty-six billion, two hundred twenty-two million, two hundred sixty-six thousand, six hundred sixty-one".