6861305899 has 6 divisors (see below), whose sum is σ = 7981519164. Its totient is φ = 5881119300.

The previous prime is 6861305861. The next prime is 6861305903. The reversal of 6861305899 is 9985031686.

It is a happy number.

6861305899 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 6861305899 - 2²⁵ = 6827751467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6861305809) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 70013277 + ... + 70013374.

It is an arithmetic number, because the mean of its divisors is an integer number (1330253194).

Almost surely, 2^6861305899 is an apocalyptic number.

6861305899 is a deficient number, since it is larger than the sum of its proper divisors (1120213265).

6861305899 is a wasteful number, since it uses less digits than its factorization.

6861305899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140026665 (or 140026658 counting only the distinct ones).

The product of its (nonzero) digits is 2799360, while the sum is 55.

The square root of 6861305899 is about 82833.0000603624. Note that the first 4 decimals coincide. The cubic root of 6861305899 is about 1900.2128938730.

The spelling of 6861305899 in words is "six billion, eight hundred sixty-one million, three hundred five thousand, eight hundred ninety-nine".