6869686561 has 4 divisors (see below), whose sum is σ = 6872564500. Its totient is φ = 6866808624.

The previous prime is 6869686541. The next prime is 6869686573. The reversal of 6869686561 is 1656869686.

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

It can be written as a sum of positive squares in 2 ways, for example, as 655360000 + 6214326561 = 25600^2 + 78831^2 .

It is a cyclic number.

It is not a de Polignac number, because 6869686561 - 2¹⁵ = 6869653793 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 6869686561.

It is not an unprimeable number, because it can be changed into a prime (6869686501) 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, 1435386 + ... + 1440163.

It is an arithmetic number, because the mean of its divisors is an integer number (1718141125).

Almost surely, 2^6869686561 is an apocalyptic number.

It is an amenable number.

6869686561 is a deficient number, since it is larger than the sum of its proper divisors (2877939).

6869686561 is a wasteful number, since it uses less digits than its factorization.

6869686561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2877938.

The product of its digits is 22394880, while the sum is 61.

The square root of 6869686561 is about 82883.5723228675. The cubic root of 6869686561 is about 1900.9862433783.

The spelling of 6869686561 in words is "six billion, eight hundred sixty-nine million, six hundred eighty-six thousand, five hundred sixty-one".