64206666 has 24 divisors (see below), whose sum is σ = 139380384. Its totient is φ = 21361320.

The previous prime is 64206631. The next prime is 64206677. The reversal of 64206666 is 66660246.

64206666 is a modest number, since divided by 6666 gives 6420 as remainder.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 64206666.

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, 7155 + ... + 13401.

It is an arithmetic number, because the mean of its divisors is an integer number (5807516).

Almost surely, 2^64206666 is an apocalyptic number.

64206666 is an abundant number, since it is smaller than the sum of its proper divisors (75173718).

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

64206666 is a wasteful number, since it uses less digits than its factorization.

64206666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6826 (or 6823 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 36.

The square root of 64206666 is about 8012.9062143519. The cubic root of 64206666 is about 400.4300915541.

The spelling of 64206666 in words is "sixty-four million, two hundred six thousand, six hundred sixty-six".