856424228911 has 4 divisors (see below), whose sum is σ = 864903676824. Its totient is φ = 847944781000.

The previous prime is 856424228873. The next prime is 856424228953. The reversal of 856424228911 is 119822424658.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 119822424658 = 2 ⋅59911212329.

It is a cyclic number.

It is not a de Polignac number, because 856424228911 - 2¹⁵ = 856424196143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856424228981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4239723805 + ... + 4239724006.

It is an arithmetic number, because the mean of its divisors is an integer number (216225919206).

Almost surely, 2^856424228911 is an apocalyptic number.

856424228911 is a deficient number, since it is larger than the sum of its proper divisors (8479447913).

856424228911 is a wasteful number, since it uses less digits than its factorization.

856424228911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8479447912.

The product of its digits is 2211840, while the sum is 52.

The spelling of 856424228911 in words is "eight hundred fifty-six billion, four hundred twenty-four million, two hundred twenty-eight thousand, nine hundred eleven".