6810869661 has 16 divisors (see below), whose sum is σ = 9235063680. Its totient is φ = 4463709120.

The previous prime is 6810869651. The next prime is 6810869701. The reversal of 6810869661 is 1669680186.

It is not a de Polignac number, because 6810869661 - 2²⁵ = 6777315229 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6810869621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 364011 + ... + 382263.

It is an arithmetic number, because the mean of its divisors is an integer number (577191480).

Almost surely, 2^6810869661 is an apocalyptic number.

6810869661 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

6810869661 is a deficient number, since it is larger than the sum of its proper divisors (2424194019).

6810869661 is a wasteful number, since it uses less digits than its factorization.

6810869661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20356.

The product of its (nonzero) digits is 746496, while the sum is 51.

The square root of 6810869661 is about 82527.9931962483. The cubic root of 6810869661 is about 1895.5453962582.

The spelling of 6810869661 in words is "six billion, eight hundred ten million, eight hundred sixty-nine thousand, six hundred sixty-one".