16666666665 has 64 divisors (see below), whose sum is σ = 29913698304. Its totient is φ = 7853760000.

The previous prime is 16666666631. The next prime is 16666666697. The reversal of 16666666665 is 56666666661.

16666666665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 16666666665 - 2⁸ = 16666666409 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16666666599 and 16666666608.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1828770 + ... + 1837860.

It is an arithmetic number, because the mean of its divisors is an integer number (467401536).

Almost surely, 2^16666666665 is an apocalyptic number.

16666666665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16666666665 is a deficient number, since it is larger than the sum of its proper divisors (13247031639).

16666666665 is a wasteful number, since it uses less digits than its factorization.

16666666665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9422.

The product of its digits is 50388480, while the sum is 60.

It can be divided in two parts, 1 and 6666666665, that added together give a palindrome (6666666666).

The spelling of 16666666665 in words is "sixteen billion, six hundred sixty-six million, six hundred sixty-six thousand, six hundred sixty-five".