6638244653 has 2 divisors, whose sum is σ = 6638244654. Its totient is φ = 6638244652.

The previous prime is 6638244649. The next prime is 6638244689. The reversal of 6638244653 is 3564428366.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6358786564 + 279458089 = 79742^2 + 16717^2 .

It is a cyclic number.

It is not a de Polignac number, because 6638244653 - 2² = 6638244649 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6638244598 and 6638244607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6638244553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3319122326 + 3319122327.

It is an arithmetic number, because the mean of its divisors is an integer number (3319122327).

Almost surely, 2^6638244653 is an apocalyptic number.

It is an amenable number.

6638244653 is a deficient number, since it is larger than the sum of its proper divisors (1).

6638244653 is an equidigital number, since it uses as much as digits as its factorization.

6638244653 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2488320, while the sum is 47.

The square root of 6638244653 is about 81475.4236135045. The cubic root of 6638244653 is about 1879.3936339510.

The spelling of 6638244653 in words is "six billion, six hundred thirty-eight million, two hundred forty-four thousand, six hundred fifty-three".