6856603511 has 4 divisors (see below), whose sum is σ = 7217477400. Its totient is φ = 6495729624.

The previous prime is 6856603493. The next prime is 6856603541. The reversal of 6856603511 is 1153066586.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6856603511 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 (6856603541) 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, 180436916 + ... + 180436953.

It is an arithmetic number, because the mean of its divisors is an integer number (1804369350).

Almost surely, 2^6856603511 is an apocalyptic number.

6856603511 is a deficient number, since it is larger than the sum of its proper divisors (360873889).

6856603511 is a wasteful number, since it uses less digits than its factorization.

6856603511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360873888.

The product of its (nonzero) digits is 129600, while the sum is 41.

The square root of 6856603511 is about 82804.6104453128. The cubic root of 6856603511 is about 1899.7786917673.

The spelling of 6856603511 in words is "six billion, eight hundred fifty-six million, six hundred three thousand, five hundred eleven".