6705684821 has 4 divisors (see below), whose sum is σ = 7315292544. Its totient is φ = 6096077100.

The previous prime is 6705684683. The next prime is 6705684823. The reversal of 6705684821 is 1284865076.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6705684821 - 2²² = 6701490517 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 (6705684823) 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, 304803845 + ... + 304803866.

It is an arithmetic number, because the mean of its divisors is an integer number (1828823136).

Almost surely, 2^6705684821 is an apocalyptic number.

It is an amenable number.

6705684821 is a deficient number, since it is larger than the sum of its proper divisors (609607723).

6705684821 is a wasteful number, since it uses less digits than its factorization.

6705684821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 609607722.

The product of its (nonzero) digits is 645120, while the sum is 47.

The square root of 6705684821 is about 81888.2459269949. The cubic root of 6705684821 is about 1885.7366666205.

The spelling of 6705684821 in words is "six billion, seven hundred five million, six hundred eighty-four thousand, eight hundred twenty-one".