6721551795 has 32 divisors (see below), whose sum is σ = 12293987328. Its totient is φ = 3071922048.

The previous prime is 6721551791. The next prime is 6721551799. The reversal of 6721551795 is 5971551276.

It is an interprime number because it is at equal distance from previous prime (6721551791) and next prime (6721551799).

It is not a de Polignac number, because 6721551795 - 2² = 6721551791 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (6721551791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 666682 + ... + 676688.

It is an arithmetic number, because the mean of its divisors is an integer number (384187104).

Almost surely, 2^6721551795 is an apocalyptic number.

6721551795 is a deficient number, since it is larger than the sum of its proper divisors (5572435533).

6721551795 is a wasteful number, since it uses less digits than its factorization.

6721551795 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16419.

The product of its digits is 661500, while the sum is 48.

The square root of 6721551795 is about 81985.0705616577. The cubic root of 6721551795 is about 1887.2228367791. Note that the first 3 decimals are identical.

The spelling of 6721551795 in words is "six billion, seven hundred twenty-one million, five hundred fifty-one thousand, seven hundred ninety-five".