6698644920 has 768 divisors, whose sum is σ = 26568622080. Its totient is φ = 1502323200.

The previous prime is 6698644853. The next prime is 6698644957. The reversal of 6698644920 is 294468966.

6698644920 is a `hidden beast` number, since 6 + 6 + 98 + 64 + 492 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

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 191 ways as a sum of consecutive naturals, for example, 142524337 + ... + 142524383.

It is an arithmetic number, because the mean of its divisors is an integer number (34594560).

Almost surely, 2^6698644920 is an apocalyptic number.

6698644920 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6698644920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13284311040).

6698644920 is an abundant number, since it is smaller than the sum of its proper divisors (19869977160).

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

6698644920 is a wasteful number, since it uses less digits than its factorization.

6698644920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158 (or 142 counting only the distinct ones).

The product of its (nonzero) digits is 4478976, while the sum is 54.

The square root of 6698644920 is about 81845.2498316182. The cubic root of 6698644920 is about 1885.0765278379.

The spelling of 6698644920 in words is "six billion, six hundred ninety-eight million, six hundred forty-four thousand, nine hundred twenty".