6642536317 has 2 divisors, whose sum is σ = 6642536318. Its totient is φ = 6642536316.

The previous prime is 6642536213. The next prime is 6642536323. The reversal of 6642536317 is 7136352466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5148636516 + 1493899801 = 71754^2 + 38651^2 .

It is a cyclic number.

It is not a de Polignac number, because 6642536317 - 2¹⁹ = 6642012029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6642536617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3321268158 + 3321268159.

It is an arithmetic number, because the mean of its divisors is an integer number (3321268159).

Almost surely, 2^6642536317 is an apocalyptic number.

It is an amenable number.

6642536317 is a deficient number, since it is larger than the sum of its proper divisors (1).

6642536317 is an equidigital number, since it uses as much as digits as its factorization.

6642536317 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 544320, while the sum is 43.

The square root of 6642536317 is about 81501.7565270835. The cubic root of 6642536317 is about 1879.7985596940.

The spelling of 6642536317 in words is "six billion, six hundred forty-two million, five hundred thirty-six thousand, three hundred seventeen".