6698644659 has 24 divisors (see below), whose sum is σ = 11060225280. Its totient is φ = 3827054448.

The previous prime is 6698644651. The next prime is 6698644661. The reversal of 6698644659 is 9564468966.

6698644659 is a `hidden beast` number, since 6 + 69 + 86 + 446 + 59 = 666.

It is not a de Polignac number, because 6698644659 - 2³ = 6698644651 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a junction number, because it is equal to n+sod(n) for n = 6698644596 and 6698644605.

It is not an unprimeable number, because it can be changed into a prime (6698644651) 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 23 ways as a sum of consecutive naturals, for example, 633514 + ... + 644000.

It is an arithmetic number, because the mean of its divisors is an integer number (460842720).

Almost surely, 2^6698644659 is an apocalyptic number.

6698644659 is a deficient number, since it is larger than the sum of its proper divisors (4361580621).

6698644659 is a wasteful number, since it uses less digits than its factorization.

6698644659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20639 (or 20636 counting only the distinct ones).

The product of its digits is 67184640, while the sum is 63.

The square root of 6698644659 is about 81845.2482371457. The cubic root of 6698644659 is about 1885.0765033551.

The spelling of 6698644659 in words is "six billion, six hundred ninety-eight million, six hundred forty-four thousand, six hundred fifty-nine".