2166666667 has 4 divisors (see below), whose sum is σ = 2363636376. Its totient is φ = 1969696960.

The previous prime is 2166666661. The next prime is 2166666673. The reversal of 2166666667 is 7666666612.

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

It is an interprime number because it is at equal distance from previous prime (2166666661) and next prime (2166666673).

It is not a de Polignac number, because 2166666667 - 2¹⁵ = 2166633899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2166666661) 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, 98484838 + ... + 98484859.

It is an arithmetic number, because the mean of its divisors is an integer number (590909094).

Almost surely, 2^2166666667 is an apocalyptic number.

2166666667 is a deficient number, since it is larger than the sum of its proper divisors (196969709).

2166666667 is a wasteful number, since it uses less digits than its factorization.

2166666667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196969708.

The product of its digits is 3919104, while the sum is 52.

The square root of 2166666667 is about 46547.4668161437. The cubic root of 2166666667 is about 1293.9893461757.

Subtracting 2166666667 from its reverse (7666666612), we obtain a palindrome (5499999945).

The spelling of 2166666667 in words is "two billion, one hundred sixty-six million, six hundred sixty-six thousand, six hundred sixty-seven".