856516510019 has 2 divisors, whose sum is σ = 856516510020. Its totient is φ = 856516510018.

The previous prime is 856516509949. The next prime is 856516510093. The reversal of 856516510019 is 910015615658.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 856516510019 - 2³² = 852221542723 is a prime.

It is a super-2 number, since 2×856516510019² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (856516530019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428258255009 + 428258255010.

It is an arithmetic number, because the mean of its divisors is an integer number (428258255010).

Almost surely, 2^856516510019 is an apocalyptic number.

856516510019 is a deficient number, since it is larger than the sum of its proper divisors (1).

856516510019 is an equidigital number, since it uses as much as digits as its factorization.

856516510019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324000, while the sum is 47.

The spelling of 856516510019 in words is "eight hundred fifty-six billion, five hundred sixteen million, five hundred ten thousand, nineteen".