6664510109 has 2 divisors, whose sum is σ = 6664510110. Its totient is φ = 6664510108.

The previous prime is 6664510103. The next prime is 6664510117. The reversal of 6664510109 is 9010154666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4603622500 + 2060887609 = 67850^2 + 45397^2 .

It is a cyclic number.

It is not a de Polignac number, because 6664510109 - 2⁸ = 6664509853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6664510103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3332255054 + 3332255055.

It is an arithmetic number, because the mean of its divisors is an integer number (3332255055).

Almost surely, 2^6664510109 is an apocalyptic number.

It is an amenable number.

6664510109 is a deficient number, since it is larger than the sum of its proper divisors (1).

6664510109 is an equidigital number, since it uses as much as digits as its factorization.

6664510109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 6664510109 is about 81636.4508598947. The cubic root of 6664510109 is about 1881.8690960293.

The spelling of 6664510109 in words is "six billion, six hundred sixty-four million, five hundred ten thousand, one hundred nine".