64813831845 has 128 divisors (see below), whose sum is σ = 124999041024. Its totient is φ = 28056720384.

The previous prime is 64813831843. The next prime is 64813831867. The reversal of 64813831845 is 54813831846.

It is not a de Polignac number, because 64813831845 - 2¹ = 64813831843 is a prime.

It is a super-3 number, since 3×64813831845³ (a number of 33 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64813831843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 63981559 + ... + 63982571.

It is an arithmetic number, because the mean of its divisors is an integer number (976555008).

Almost surely, 2^64813831845 is an apocalyptic number.

It is an amenable number.

64813831845 is a deficient number, since it is larger than the sum of its proper divisors (60185209179).

64813831845 is a wasteful number, since it uses less digits than its factorization.

64813831845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1491.

The product of its digits is 2211840, while the sum is 51.

Subtracting from 64813831845 its reverse (54813831846), we obtain a palindrome (9999999999).

The spelling of 64813831845 in words is "sixty-four billion, eight hundred thirteen million, eight hundred thirty-one thousand, eight hundred forty-five".