6687123697 has 2 divisors, whose sum is σ = 6687123698. Its totient is φ = 6687123696.

The previous prime is 6687123673. The next prime is 6687123713. The reversal of 6687123697 is 7963217866.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3718072576 + 2969051121 = 60976^2 + 54489^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6687123697 is a prime.

It is not a weakly prime, because it can be changed into another prime (6687123607) 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 as a sum of consecutive naturals, namely, 3343561848 + 3343561849.

It is an arithmetic number, because the mean of its divisors is an integer number (3343561849).

Almost surely, 2^6687123697 is an apocalyptic number.

It is an amenable number.

6687123697 is a deficient number, since it is larger than the sum of its proper divisors (1).

6687123697 is an equidigital number, since it uses as much as digits as its factorization.

6687123697 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4572288, while the sum is 55.

The square root of 6687123697 is about 81774.8353529373. The cubic root of 6687123697 is about 1883.9951722995.

The spelling of 6687123697 in words is "six billion, six hundred eighty-seven million, one hundred twenty-three thousand, six hundred ninety-seven".