6520136530109 has 2 divisors, whose sum is σ = 6520136530110. Its totient is φ = 6520136530108.

The previous prime is 6520136530081. The next prime is 6520136530139. The reversal of 6520136530109 is 9010356310256.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4372373004484 + 2147763525625 = 2091022^2 + 1465525^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6520136530109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6520136530139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3260068265054 + 3260068265055.

It is an arithmetic number, because the mean of its divisors is an integer number (3260068265055).

Almost surely, 2^{6520136530109} is an apocalyptic number.

It is an amenable number.

6520136530109 is a deficient number, since it is larger than the sum of its proper divisors (1).

6520136530109 is an equidigital number, since it uses as much as digits as its factorization.

6520136530109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145800, while the sum is 41.

The spelling of 6520136530109 in words is "six trillion, five hundred twenty billion, one hundred thirty-six million, five hundred thirty thousand, one hundred nine".