64611632513 has 2 divisors, whose sum is σ = 64611632514. Its totient is φ = 64611632512.

The previous prime is 64611632467. The next prime is 64611632521. The reversal of 64611632513 is 31523611646.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42118531984 + 22493100529 = 205228^2 + 149977^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64611632513 is a prime.

It is not a weakly prime, because it can be changed into another prime (64611632563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32305816256 + 32305816257.

It is an arithmetic number, because the mean of its divisors is an integer number (32305816257).

Almost surely, 2^64611632513 is an apocalyptic number.

It is an amenable number.

64611632513 is a deficient number, since it is larger than the sum of its proper divisors (1).

64611632513 is an equidigital number, since it uses as much as digits as its factorization.

64611632513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 77760, while the sum is 38.

The spelling of 64611632513 in words is "sixty-four billion, six hundred eleven million, six hundred thirty-two thousand, five hundred thirteen".