6505855123 has 2 divisors, whose sum is σ = 6505855124. Its totient is φ = 6505855122.

The previous prime is 6505855121. The next prime is 6505855133. The reversal of 6505855123 is 3215585056.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6505855123 - 2¹ = 6505855121 is a prime.

Together with 6505855121, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (6505855121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3252927561 + 3252927562.

It is an arithmetic number, because the mean of its divisors is an integer number (3252927562).

Almost surely, 2^6505855123 is an apocalyptic number.

6505855123 is a deficient number, since it is larger than the sum of its proper divisors (1).

6505855123 is an equidigital number, since it uses as much as digits as its factorization.

6505855123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 180000, while the sum is 40.

The square root of 6505855123 is about 80658.8812406917. The cubic root of 6505855123 is about 1866.8157772078.

The spelling of 6505855123 in words is "six billion, five hundred five million, eight hundred fifty-five thousand, one hundred twenty-three".