856545659 has 4 divisors (see below), whose sum is σ = 858112104. Its totient is φ = 854979216.

The previous prime is 856545649. The next prime is 856545689. The reversal of 856545659 is 956545658.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 956545658 = 2 ⋅478272829.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-856545659 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 856545659.

It is not an unprimeable number, because it can be changed into a prime (856545619) 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, 782402 + ... + 783495.

It is an arithmetic number, because the mean of its divisors is an integer number (214528026).

Almost surely, 2^856545659 is an apocalyptic number.

856545659 is a deficient number, since it is larger than the sum of its proper divisors (1566445).

856545659 is a wasteful number, since it uses less digits than its factorization.

856545659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1566444.

The product of its digits is 6480000, while the sum is 53.

The square root of 856545659 is about 29266.8013113835. The cubic root of 856545659 is about 949.6935887159.

Subtracting 856545659 from its reverse (956545658), we obtain a palindrome (99999999).

The spelling of 856545659 in words is "eight hundred fifty-six million, five hundred forty-five thousand, six hundred fifty-nine".