856674418609 has 2 divisors, whose sum is σ = 856674418610. Its totient is φ = 856674418608.

The previous prime is 856674418577. The next prime is 856674418627. The reversal of 856674418609 is 906814476658.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 534612493584 + 322061925025 = 731172^2 + 567505^2 .

It is a cyclic number.

It is not a de Polignac number, because 856674418609 - 2⁵ = 856674418577 is a prime.

It is not a weakly prime, because it can be changed into another prime (856674718609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428337209304 + 428337209305.

It is an arithmetic number, because the mean of its divisors is an integer number (428337209305).

Almost surely, 2^856674418609 is an apocalyptic number.

It is an amenable number.

856674418609 is a deficient number, since it is larger than the sum of its proper divisors (1).

856674418609 is an equidigital number, since it uses as much as digits as its factorization.

856674418609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69672960, while the sum is 64.

The spelling of 856674418609 in words is "eight hundred fifty-six billion, six hundred seventy-four million, four hundred eighteen thousand, six hundred nine".