64840340875 has 8 divisors (see below), whose sum is σ = 80920745568. Its totient is φ = 51872272600.

The previous prime is 64840340863. The next prime is 64840340879. The reversal of 64840340875 is 57804304846.

It is not a de Polignac number, because 64840340875 - 2⁹ = 64840340363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64840340879) 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, 259361239 + ... + 259361488.

It is an arithmetic number, because the mean of its divisors is an integer number (10115093196).

Almost surely, 2^64840340875 is an apocalyptic number.

64840340875 is a deficient number, since it is larger than the sum of its proper divisors (16080404693).

64840340875 is an equidigital number, since it uses as much as digits as its factorization.

64840340875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518722742 (or 518722732 counting only the distinct ones).

The product of its (nonzero) digits is 2580480, while the sum is 49.

The spelling of 64840340875 in words is "sixty-four billion, eight hundred forty million, three hundred forty thousand, eight hundred seventy-five".