856909694239 has 2 divisors, whose sum is σ = 856909694240. Its totient is φ = 856909694238.

The previous prime is 856909694227. The next prime is 856909694261. The reversal of 856909694239 is 932496909658.

856909694239 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 856909694239 - 2²¹ = 856907597087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (856909694339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428454847119 + 428454847120.

It is an arithmetic number, because the mean of its divisors is an integer number (428454847120).

Almost surely, 2^856909694239 is an apocalyptic number.

856909694239 is a deficient number, since it is larger than the sum of its proper divisors (1).

856909694239 is an equidigital number, since it uses as much as digits as its factorization.

856909694239 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 226748160, while the sum is 70.

The spelling of 856909694239 in words is "eight hundred fifty-six billion, nine hundred nine million, six hundred ninety-four thousand, two hundred thirty-nine".