856708606609 has 2 divisors, whose sum is σ = 856708606610. Its totient is φ = 856708606608.

The previous prime is 856708606573. The next prime is 856708606631. The reversal of 856708606609 is 906606807658.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 434936293009 + 421772313600 = 659497^2 + 649440^2 .

It is a cyclic number.

It is not a de Polignac number, because 856708606609 - 2²³ = 856700218001 is a prime.

It is not a weakly prime, because it can be changed into another prime (856708603609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428354303304 + 428354303305.

It is an arithmetic number, because the mean of its divisors is an integer number (428354303305).

Almost surely, 2^856708606609 is an apocalyptic number.

It is an amenable number.

856708606609 is a deficient number, since it is larger than the sum of its proper divisors (1).

856708606609 is an equidigital number, since it uses as much as digits as its factorization.

856708606609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26127360, while the sum is 61.

The spelling of 856708606609 in words is "eight hundred fifty-six billion, seven hundred eight million, six hundred six thousand, six hundred nine".