64389518813 has 2 divisors, whose sum is σ = 64389518814. Its totient is φ = 64389518812.

The previous prime is 64389518807. The next prime is 64389518833. The reversal of 64389518813 is 31881598346.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51462283609 + 12927235204 = 226853^2 + 113698^2 .

It is a cyclic number.

It is not a de Polignac number, because 64389518813 - 2⁶ = 64389518749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64389518833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32194759406 + 32194759407.

It is an arithmetic number, because the mean of its divisors is an integer number (32194759407).

Almost surely, 2^64389518813 is an apocalyptic number.

It is an amenable number.

64389518813 is a deficient number, since it is larger than the sum of its proper divisors (1).

64389518813 is an equidigital number, since it uses as much as digits as its factorization.

64389518813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4976640, while the sum is 56.

The spelling of 64389518813 in words is "sixty-four billion, three hundred eighty-nine million, five hundred eighteen thousand, eight hundred thirteen".