6513644693 has 2 divisors, whose sum is σ = 6513644694. Its totient is φ = 6513644692.

The previous prime is 6513644681. The next prime is 6513644723. The reversal of 6513644693 is 3964463156.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3324444964 + 3189199729 = 57658^2 + 56473^2 .

It is a cyclic number.

It is not a de Polignac number, because 6513644693 - 2⁸ = 6513644437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6513644623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3256822346 + 3256822347.

It is an arithmetic number, because the mean of its divisors is an integer number (3256822347).

Almost surely, 2^6513644693 is an apocalyptic number.

It is an amenable number.

6513644693 is a deficient number, since it is larger than the sum of its proper divisors (1).

6513644693 is an equidigital number, since it uses as much as digits as its factorization.

6513644693 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1399680, while the sum is 47.

The square root of 6513644693 is about 80707.1539146314. The cubic root of 6513644693 is about 1867.5605367147.

The spelling of 6513644693 in words is "six billion, five hundred thirteen million, six hundred forty-four thousand, six hundred ninety-three".