6721678646 has 8 divisors (see below), whose sum is σ = 10090154424. Its totient is φ = 3358293840.

The previous prime is 6721678643. The next prime is 6721678651. The reversal of 6721678646 is 6468761276.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6721678643) 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, 1269440 + ... + 1274723.

It is an arithmetic number, because the mean of its divisors is an integer number (1261269303).

Almost surely, 2^6721678646 is an apocalyptic number.

6721678646 is a deficient number, since it is larger than the sum of its proper divisors (3368475778).

6721678646 is a wasteful number, since it uses less digits than its factorization.

6721678646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2545486.

The product of its digits is 4064256, while the sum is 53.

The square root of 6721678646 is about 81985.8441805657. The cubic root of 6721678646 is about 1887.2347087696.

The spelling of 6721678646 in words is "six billion, seven hundred twenty-one million, six hundred seventy-eight thousand, six hundred forty-six".