856491133811 has 8 divisors (see below), whose sum is σ = 874727506944. Its totient is φ = 838255309000.

The previous prime is 856491133789. The next prime is 856491133819. The reversal of 856491133811 is 118331194658.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 856491133811 - 2²² = 856486939507 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 856491133811.

It is not an unprimeable number, because it can be changed into a prime (856491133819) 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 7 ways as a sum of consecutive naturals, for example, 5247686 + ... + 5408436.

It is an arithmetic number, because the mean of its divisors is an integer number (109340938368).

Almost surely, 2^856491133811 is an apocalyptic number.

856491133811 is a deficient number, since it is larger than the sum of its proper divisors (18236373133).

856491133811 is a wasteful number, since it uses less digits than its factorization.

856491133811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274161.

The product of its digits is 622080, while the sum is 50.

The spelling of 856491133811 in words is "eight hundred fifty-six billion, four hundred ninety-one million, one hundred thirty-three thousand, eight hundred eleven".