2666668666667 has 8 divisors (see below), whose sum is σ = 2731741463472. Its totient is φ = 2601597398400.

The previous prime is 2666668666661. The next prime is 2666668666709. The reversal of 2666668666667 is 7666668666662.

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 2666668666667 - 2⁶ = 2666668666603 is a prime.

It is a super-2 number, since 2×2666668666667² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2666668666661) 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, 3666668 + ... + 4333334.

It is an arithmetic number, because the mean of its divisors is an integer number (341467682934).

Almost surely, 2^{2666668666667} is an apocalyptic number.

2666668666667 is the 1333334-th pentagonal number.

2666668666667 is a deficient number, since it is larger than the sum of its proper divisors (65072796805).

2666668666667 is an equidigital number, since it uses as much as digits as its factorization.

2666668666667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 764269.

The product of its digits is 6772211712, while the sum is 77.

It can be divided in two parts, 2666668 and 666667, that multiplied together give a square (1777779555556 = 1333334²).

The spelling of 2666668666667 in words is "two trillion, six hundred sixty-six billion, six hundred sixty-eight million, six hundred sixty-six thousand, six hundred sixty-seven".