866666664 has 48 divisors (see below), whose sum is σ = 2485297620. Its totient is φ = 271895040.

The previous prime is 866666609. The next prime is 866666687. The reversal of 866666664 is 466666668.

It can be written as a sum of positive squares in 2 ways, for example, as 831168900 + 35497764 = 28830^2 + 5958^2 .

It is a super-2 number, since 2×866666664² = 1502222212977777792, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 866666664.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 352807 + ... + 355254.

Almost surely, 2^866666664 is an apocalyptic number.

It is an amenable number.

866666664 is an abundant number, since it is smaller than the sum of its proper divisors (1618630956).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

866666664 is a wasteful number, since it uses less digits than its factorization.

866666664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 708090 (or 708083 counting only the distinct ones).

The product of its digits is 8957952, while the sum is 54.

The square root of 866666664 is about 29439.2028424684. The cubic root of 866666664 is about 953.4195010165.

The spelling of 866666664 in words is "eight hundred sixty-six million, six hundred sixty-six thousand, six hundred sixty-four".