64521534572513 has 2 divisors, whose sum is σ = 64521534572514. Its totient is φ = 64521534572512.

The previous prime is 64521534572507. The next prime is 64521534572533. The reversal of 64521534572513 is 31527543512546.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38704038660049 + 25817495912464 = 6221257^2 + 5081092^2 .

It is a cyclic number.

It is not a de Polignac number, because 64521534572513 - 2⁶ = 64521534572449 is a prime.

It is not a weakly prime, because it can be changed into another prime (64521534572533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32260767286256 + 32260767286257.

It is an arithmetic number, because the mean of its divisors is an integer number (32260767286257).

Almost surely, 2^{64521534572513} is an apocalyptic number.

It is an amenable number.

64521534572513 is a deficient number, since it is larger than the sum of its proper divisors (1).

64521534572513 is an equidigital number, since it uses as much as digits as its factorization.

64521534572513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120000, while the sum is 53.

The spelling of 64521534572513 in words is "sixty-four trillion, five hundred twenty-one billion, five hundred thirty-four million, five hundred seventy-two thousand, five hundred thirteen".