6698557920 has 288 divisors, whose sum is σ = 22700926080. Its totient is φ = 1655700480.

The previous prime is 6698557919. The next prime is 6698557933. The reversal of 6698557920 is 297558966.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 31746615 + ... + 31746825.

It is an arithmetic number, because the mean of its divisors is an integer number (78822660).

Almost surely, 2^6698557920 is an apocalyptic number.

6698557920 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 6698557920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11350463040).

6698557920 is an abundant number, since it is smaller than the sum of its proper divisors (16002368160).

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

6698557920 is a wasteful number, since it uses less digits than its factorization.

6698557920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366 (or 299 counting only the distinct ones).

The product of its (nonzero) digits is 8164800, while the sum is 57.

The square root of 6698557920 is about 81844.7183390596. The cubic root of 6698557920 is about 1885.0683668656.

The spelling of 6698557920 in words is "six billion, six hundred ninety-eight million, five hundred fifty-seven thousand, nine hundred twenty".