6643486753 has 2 divisors, whose sum is σ = 6643486754. Its totient is φ = 6643486752.

The previous prime is 6643486741. The next prime is 6643486769. The reversal of 6643486753 is 3576843466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4779233424 + 1864253329 = 69132^2 + 43177^2 .

It is a cyclic number.

It is not a de Polignac number, because 6643486753 - 2¹³ = 6643478561 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6643486753.

It is not a weakly prime, because it can be changed into another prime (6643486153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3321743376 + 3321743377.

It is an arithmetic number, because the mean of its divisors is an integer number (3321743377).

Almost surely, 2^6643486753 is an apocalyptic number.

It is an amenable number.

6643486753 is a deficient number, since it is larger than the sum of its proper divisors (1).

6643486753 is an equidigital number, since it uses as much as digits as its factorization.

6643486753 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8709120, while the sum is 52.

The square root of 6643486753 is about 81507.5870885650. The cubic root of 6643486753 is about 1879.8882113437. Note that the first 3 decimals are identical.

The spelling of 6643486753 in words is "six billion, six hundred forty-three million, four hundred eighty-six thousand, seven hundred fifty-three".