6695322721 has 4 divisors (see below), whose sum is σ = 7089165252. Its totient is φ = 6301480192.

The previous prime is 6695322719. The next prime is 6695322727. The reversal of 6695322721 is 1272235966.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1272235966 = 2 ⋅636117983.

It can be written as a sum of positive squares in 2 ways, for example, as 2186871696 + 4508451025 = 46764^2 + 67145^2 .

It is a cyclic number.

It is not a de Polignac number, because 6695322721 - 2¹ = 6695322719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6695322727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 196921240 + ... + 196921273.

It is an arithmetic number, because the mean of its divisors is an integer number (1772291313).

Almost surely, 2^6695322721 is an apocalyptic number.

It is an amenable number.

6695322721 is a deficient number, since it is larger than the sum of its proper divisors (393842531).

6695322721 is a wasteful number, since it uses less digits than its factorization.

6695322721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393842530.

The product of its digits is 272160, while the sum is 43.

The square root of 6695322721 is about 81824.9517017884. The cubic root of 6695322721 is about 1884.7648411695.

The spelling of 6695322721 in words is "six billion, six hundred ninety-five million, three hundred twenty-two thousand, seven hundred twenty-one".