64666646 has 8 divisors (see below), whose sum is σ = 105818184. Its totient is φ = 29393920.

The previous prime is 64666643. The next prime is 64666661.

64666646 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 64666597 and 64666606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64666643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1469675 + ... + 1469718.

It is an arithmetic number, because the mean of its divisors is an integer number (13227273).

Almost surely, 2^64666646 is an apocalyptic number.

64666646 is a deficient number, since it is larger than the sum of its proper divisors (41151538).

64666646 is a wasteful number, since it uses less digits than its factorization.

64666646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2939406.

The product of its digits is 746496, while the sum is 44.

The square root of 64666646 is about 8041.5574362184. The cubic root of 64666646 is about 401.3840513147.

The spelling of 64666646 in words is "sixty-four million, six hundred sixty-six thousand, six hundred forty-six".