6687748999 has 2 divisors, whose sum is σ = 6687749000. Its totient is φ = 6687748998.

The previous prime is 6687748997. The next prime is 6687749011. The reversal of 6687748999 is 9998477866.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6687748999 - 2¹ = 6687748997 is a prime.

Together with 6687748997, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6687748993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3343874499 + 3343874500.

It is an arithmetic number, because the mean of its divisors is an integer number (3343874500).

Almost surely, 2^6687748999 is an apocalyptic number.

6687748999 is a deficient number, since it is larger than the sum of its proper divisors (1).

6687748999 is an equidigital number, since it uses as much as digits as its factorization.

6687748999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 329204736, while the sum is 73.

The square root of 6687748999 is about 81778.6585791183. The cubic root of 6687748999 is about 1884.0538935716.

The spelling of 6687748999 in words is "six billion, six hundred eighty-seven million, seven hundred forty-eight thousand, nine hundred ninety-nine".