64650217785 has 8 divisors (see below), whose sum is σ = 103440348480. Its totient is φ = 34480116144.

The previous prime is 64650217783. The next prime is 64650217787. The reversal of 64650217785 is 58771205646.

It is an interprime number because it is at equal distance from previous prime (64650217783) and next prime (64650217787).

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

It is not a de Polignac number, because 64650217785 - 2¹ = 64650217783 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (64650217783) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 2155007245 + ... + 2155007274.

It is an arithmetic number, because the mean of its divisors is an integer number (12930043560).

Almost surely, 2^64650217785 is an apocalyptic number.

It is an amenable number.

64650217785 is a deficient number, since it is larger than the sum of its proper divisors (38790130695).

64650217785 is a wasteful number, since it uses less digits than its factorization.

64650217785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4310014527.

The product of its (nonzero) digits is 2822400, while the sum is 51.

The spelling of 64650217785 in words is "sixty-four billion, six hundred fifty million, two hundred seventeen thousand, seven hundred eighty-five".