856394649511 has 4 divisors (see below), whose sum is σ = 856404900000. Its totient is φ = 856384399024.

The previous prime is 856394649463. The next prime is 856394649521. The reversal of 856394649511 is 115946493658.

It is a happy number.

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 856394649511 - 2¹⁵ = 856394616743 is a prime.

It is a super-2 number, since 2×856394649511² (a number of 25 digits) contains 22 as substring.

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 856394649511.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856394649521) 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, 4998886 + ... + 5167363.

It is an arithmetic number, because the mean of its divisors is an integer number (214101225000).

Almost surely, 2^856394649511 is an apocalyptic number.

856394649511 is a deficient number, since it is larger than the sum of its proper divisors (10250489).

856394649511 is a wasteful number, since it uses less digits than its factorization.

856394649511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10250488.

The product of its digits is 27993600, while the sum is 61.

The spelling of 856394649511 in words is "eight hundred fifty-six billion, three hundred ninety-four million, six hundred forty-nine thousand, five hundred eleven".