16666266661 has 24 divisors (see below), whose sum is σ = 18622234400. Its totient is φ = 14902509600.

The previous prime is 16666266649. The next prime is 16666266667.

16666266661 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 16666266661 - 2⁵ = 16666266629 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16666266599 and 16666266608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16666266667) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1828726 + ... + 1837816.

Almost surely, 2^16666266661 is an apocalyptic number.

16666266661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16666266661 is a deficient number, since it is larger than the sum of its proper divisors (1955967739).

16666266661 is a wasteful number, since it uses less digits than its factorization.

16666266661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9361 (or 9350 counting only the distinct ones).

The product of its digits is 3359232, while the sum is 52.

The spelling of 16666266661 in words is "sixteen billion, six hundred sixty-six million, two hundred sixty-six thousand, six hundred sixty-one".