2666688999999 has 32 divisors (see below), whose sum is σ = 3581345617920. Its totient is φ = 1764962825472.

The previous prime is 2666688999979. The next prime is 2666689000067. The reversal of 2666688999999 is 9999998866662.

It is a Cunningham number, because it is equal to 1633000²-1.

It is not a de Polignac number, because 2666688999999 - 2¹² = 2666688995903 is a prime.

It is a super-2 number, since 2×2666688999999² (a number of 26 digits) contains 22 as substring.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2666688999979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 756076774 + ... + 756080300.

It is an arithmetic number, because the mean of its divisors is an integer number (111917050560).

Almost surely, 2^{2666688999999} is an apocalyptic number.

2666688999999 is a deficient number, since it is larger than the sum of its proper divisors (914656617921).

2666688999999 is a wasteful number, since it uses less digits than its factorization.

2666688999999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6599.

The product of its digits is 88159684608, while the sum is 96.

The spelling of 2666688999999 in words is "two trillion, six hundred sixty-six billion, six hundred eighty-eight million, nine hundred ninety-nine thousand, nine hundred ninety-nine".