866666666666666 has 16 divisors (see below), whose sum is σ = 1300203574392744. Its totient is φ = 433265476722624.

The previous prime is 866666666666639. The next prime is 866666666666681. The reversal of 866666666666666 is 666666666666668.

It can be written as a sum of positive squares in 4 ways, for example, as 835641532726225 + 31025133940441 = 28907465^2 + 5570021^2 .

It is a super-2 number, since 2×866666666666666² (a number of 31 digits) contains 22 as substring.

866666666666666 is a modest number, since divided by 66666666 gives 8666666 as remainder.

It is a nialpdrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1316847656 + ... + 1317505628.

Almost surely, 2^{866666666666666} is an apocalyptic number.

866666666666666 is a deficient number, since it is larger than the sum of its proper divisors (433536907726078).

866666666666666 is a wasteful number, since it uses less digits than its factorization.

866666666666666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 760105.

The product of its digits is 626913312768, while the sum is 92.

The spelling of 866666666666666 in words is "eight hundred sixty-six trillion, six hundred sixty-six billion, six hundred sixty-six million, six hundred sixty-six thousand, six hundred sixty-six".