856285230979 has 4 divisors (see below), whose sum is σ = 856353686080. Its totient is φ = 856216775880.

The previous prime is 856285230971. The next prime is 856285231031. The reversal of 856285230979 is 979032582658.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 856285230979 - 2³ = 856285230971 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 856285230979.

It is not an unprimeable number, because it can be changed into a prime (856285230971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34208784 + ... + 34233805.

It is an arithmetic number, because the mean of its divisors is an integer number (214088421520).

Almost surely, 2^856285230979 is an apocalyptic number.

856285230979 is a deficient number, since it is larger than the sum of its proper divisors (68455101).

856285230979 is a wasteful number, since it uses less digits than its factorization.

856285230979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68455100.

The product of its (nonzero) digits is 65318400, while the sum is 64.

The spelling of 856285230979 in words is "eight hundred fifty-six billion, two hundred eighty-five million, two hundred thirty thousand, nine hundred seventy-nine".