2666666666 has 8 divisors (see below), whose sum is σ = 4025478180. Its totient is φ = 1324840608.

The previous prime is 2666666659. The next prime is 2666666689. The reversal of 2666666666 is 6666666662.

It can be written as a sum of positive squares in 2 ways, for example, as 2665553641 + 1113025 = 51629^2 + 1055^2 .

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

It is a super-2 number, since 2×2666666666² = 14222222215111111112, which contains 22 as substring.

2666666666 is a modest number, since divided by 66666 gives 26666 as remainder.

It is a plaindrome in base 10.

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 3 ways as a sum of consecutive naturals, for example, 4245971 + ... + 4246598.

Almost surely, 2^2666666666 is an apocalyptic number.

2666666666 is a deficient number, since it is larger than the sum of its proper divisors (1358811514).

2666666666 is a wasteful number, since it uses less digits than its factorization.

2666666666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8492728.

The product of its digits is 20155392, while the sum is 56.

The square root of 2666666666 is about 51639.7779429773. Note that the first 3 decimals coincide. The cubic root of 2666666666 is about 1386.7225485857.

The spelling of 2666666666 in words is "two billion, six hundred sixty-six million, six hundred sixty-six thousand, six hundred sixty-six".