6697718221 has 16 divisors (see below), whose sum is σ = 7054387200. Its totient is φ = 6352136320.

The previous prime is 6697718161. The next prime is 6697718231. The reversal of 6697718221 is 1228177966.

It is a cyclic number.

It is not a de Polignac number, because 6697718221 - 2⁹ = 6697717709 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 (6697718231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 275460 + ... + 298786.

It is an arithmetic number, because the mean of its divisors is an integer number (440899200).

Almost surely, 2^6697718221 is an apocalyptic number.

It is an amenable number.

6697718221 is a deficient number, since it is larger than the sum of its proper divisors (356668979).

6697718221 is a wasteful number, since it uses less digits than its factorization.

6697718221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23564.

The product of its digits is 508032, while the sum is 49.

The square root of 6697718221 is about 81839.5883481827. The cubic root of 6697718221 is about 1884.9895958730.

The spelling of 6697718221 in words is "six billion, six hundred ninety-seven million, seven hundred eighteen thousand, two hundred twenty-one".