6639227653 has 2 divisors, whose sum is σ = 6639227654. Its totient is φ = 6639227652.

The previous prime is 6639227597. The next prime is 6639227701. The reversal of 6639227653 is 3567229366.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5913302404 + 725925249 = 76898^2 + 26943^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6639227653 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6639227597 and 6639227606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6639287653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3319613826 + 3319613827.

It is an arithmetic number, because the mean of its divisors is an integer number (3319613827).

Almost surely, 2^6639227653 is an apocalyptic number.

It is an amenable number.

6639227653 is a deficient number, since it is larger than the sum of its proper divisors (1).

6639227653 is an equidigital number, since it uses as much as digits as its factorization.

6639227653 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2449440, while the sum is 49.

The square root of 6639227653 is about 81481.4558841458. The cubic root of 6639227653 is about 1879.4863970661.

The spelling of 6639227653 in words is "six billion, six hundred thirty-nine million, two hundred twenty-seven thousand, six hundred fifty-three".