64001666 has 24 divisors (see below), whose sum is σ = 101343420. Its totient is φ = 30277856.

The previous prime is 64001657. The next prime is 64001711. The reversal of 64001666 is 66610046.

It can be written as a sum of positive squares in 2 ways, for example, as 59737441 + 4264225 = 7729^2 + 2065^2 .

It is a Harshad number since it is a multiple of its sum of digits (29).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 201740 + ... + 202056.

Almost surely, 2^64001666 is an apocalyptic number.

64001666 is a deficient number, since it is larger than the sum of its proper divisors (37341754).

64001666 is a wasteful number, since it uses less digits than its factorization.

64001666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 466 (or 407 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 64001666 is about 8000.1041243224. The cubic root of 64001666 is about 400.0034708032.

The spelling of 64001666 in words is "sixty-four million, one thousand, six hundred sixty-six".