6649171253 has 2 divisors, whose sum is σ = 6649171254. Its totient is φ = 6649171252.

The previous prime is 6649171219. The next prime is 6649171273. The reversal of 6649171253 is 3521719466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4953625924 + 1695545329 = 70382^2 + 41177^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6649171253 is a prime.

It is a super-2 number, since 2×6649171253² = 88422956703443180018, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6649171273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3324585626 + 3324585627.

It is an arithmetic number, because the mean of its divisors is an integer number (3324585627).

Almost surely, 2^6649171253 is an apocalyptic number.

It is an amenable number.

6649171253 is a deficient number, since it is larger than the sum of its proper divisors (1).

6649171253 is an equidigital number, since it uses as much as digits as its factorization.

6649171253 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 272160, while the sum is 44.

The square root of 6649171253 is about 81542.4506192940. The cubic root of 6649171253 is about 1880.4242339923.

The spelling of 6649171253 in words is "six billion, six hundred forty-nine million, one hundred seventy-one thousand, two hundred fifty-three".