64839163845457 has 4 divisors (see below), whose sum is σ = 66591573679156. Its totient is φ = 63086754011760.

The previous prime is 64839163845413. The next prime is 64839163845539. The reversal of 64839163845457 is 75454836193846.

64839163845457 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 62529125591296 + 2310038254161 = 7907536^2 + 1519881^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64839163845457 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64839163845457.

It is not an unprimeable number, because it can be changed into a prime (64839163815457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 876204916794 + ... + 876204916867.

It is an arithmetic number, because the mean of its divisors is an integer number (16647893419789).

Almost surely, 2^{64839163845457} is an apocalyptic number.

It is an amenable number.

64839163845457 is a deficient number, since it is larger than the sum of its proper divisors (1752409833699).

64839163845457 is a wasteful number, since it uses less digits than its factorization.

64839163845457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1752409833698.

The product of its digits is 2090188800, while the sum is 73.

The spelling of 64839163845457 in words is "sixty-four trillion, eight hundred thirty-nine billion, one hundred sixty-three million, eight hundred forty-five thousand, four hundred fifty-seven".