64665256646 has 8 divisors (see below), whose sum is σ = 98828033904. Its totient is φ = 31722578680.

The previous prime is 64665256619. The next prime is 64665256679.

It is a happy number.

64665256646 is nontrivially palindromic in base 10.

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 64665256591 and 64665256600.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 305024690 + ... + 305024901.

It is an arithmetic number, because the mean of its divisors is an integer number (12353504238).

Almost surely, 2^64665256646 is an apocalyptic number.

64665256646 is a deficient number, since it is larger than the sum of its proper divisors (34162777258).

64665256646 is a wasteful number, since it uses less digits than its factorization.

64665256646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610049646.

The product of its digits is 37324800, while the sum is 56.

The spelling of 64665256646 in words is "sixty-four billion, six hundred sixty-five million, two hundred fifty-six thousand, six hundred forty-six".