64664846647 has 16 divisors (see below), whose sum is σ = 66481776000. Its totient is φ = 62867589120.

The previous prime is 64664846593. The next prime is 64664846669. The reversal of 64664846647 is 74664846646.

64664846647 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 64664846647 - 2¹⁵ = 64664813879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64664846747) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4825897 + ... + 4839277.

It is an arithmetic number, because the mean of its divisors is an integer number (4155111000).

Almost surely, 2^64664846647 is an apocalyptic number.

64664846647 is a deficient number, since it is larger than the sum of its proper divisors (1816929353).

64664846647 is a wasteful number, since it uses less digits than its factorization.

64664846647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14106.

The product of its digits is 111476736, while the sum is 61.

Subtracting 64664846647 from its reverse (74664846646), we obtain a palindrome (9999999999).

The spelling of 64664846647 in words is "sixty-four billion, six hundred sixty-four million, eight hundred forty-six thousand, six hundred forty-seven".