64304136581 has 2 divisors, whose sum is σ = 64304136582. Its totient is φ = 64304136580.

The previous prime is 64304136509. The next prime is 64304136601. The reversal of 64304136581 is 18563140346.

64304136581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42234360100 + 22069776481 = 205510^2 + 148559^2 .

It is a cyclic number.

It is not a de Polignac number, because 64304136581 - 2¹⁰ = 64304135557 is a prime.

It is a super-2 number, since 2×64304136581² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64304136881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32152068290 + 32152068291.

It is an arithmetic number, because the mean of its divisors is an integer number (32152068291).

Almost surely, 2^64304136581 is an apocalyptic number.

It is an amenable number.

64304136581 is a deficient number, since it is larger than the sum of its proper divisors (1).

64304136581 is an equidigital number, since it uses as much as digits as its factorization.

64304136581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 207360, while the sum is 41.

The spelling of 64304136581 in words is "sixty-four billion, three hundred four million, one hundred thirty-six thousand, five hundred eighty-one".