6696645720 has 32 divisors (see below), whose sum is σ = 20089937520. Its totient is φ = 1785772160.

The previous prime is 6696645689. The next prime is 6696645727. The reversal of 6696645720 is 275466966.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6696645727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27902571 + ... + 27902810.

Almost surely, 2^6696645720 is an apocalyptic number.

6696645720 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6696645720 is an abundant number, since it is smaller than the sum of its proper divisors (13393291800).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6696645720 is a wasteful number, since it uses less digits than its factorization.

6696645720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55805395 (or 55805391 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 51.

The square root of 6696645720 is about 81833.0356274286. The cubic root of 6696645720 is about 1884.8889764741. Note that the first 3 decimals are identical.

The spelling of 6696645720 in words is "six billion, six hundred ninety-six million, six hundred forty-five thousand, seven hundred twenty".