6687123698 has 8 divisors (see below), whose sum is σ = 10275336540. Its totient is φ = 3262011520.

The previous prime is 6687123697. The next prime is 6687123713. The reversal of 6687123698 is 8963217866.

It can be written as a sum of positive squares in 2 ways, for example, as 5487401929 + 1199721769 = 74077^2 + 34637^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (6687123697) 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 in 3 ways as a sum of consecutive naturals, for example, 40775063 + ... + 40775226.

Almost surely, 2^6687123698 is an apocalyptic number.

6687123698 is a deficient number, since it is larger than the sum of its proper divisors (3588212842).

6687123698 is a wasteful number, since it uses less digits than its factorization.

6687123698 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81550332.

The product of its digits is 5225472, while the sum is 56.

The square root of 6687123698 is about 81774.8353590516. The cubic root of 6687123698 is about 1883.9951723934.

The spelling of 6687123698 in words is "six billion, six hundred eighty-seven million, one hundred twenty-three thousand, six hundred ninety-eight".