6998558688 has 216 divisors, whose sum is σ = 22346591904. Its totient is φ = 2075166720.

The previous prime is 6998558663. The next prime is 6998558689. The reversal of 6998558688 is 8868558996.

6998558688 is a `hidden beast` number, since 6 + 9 + 9 + 8 + 558 + 68 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6998558689) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1635720 + ... + 1639992.

It is an arithmetic number, because the mean of its divisors is an integer number (103456444).

Almost surely, 2^6998558688 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6998558688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11173295952).

6998558688 is an abundant number, since it is smaller than the sum of its proper divisors (15348033216).

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

6998558688 is a wasteful number, since it uses less digits than its factorization.

6998558688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4358 (or 4336 counting only the distinct ones).

The product of its digits is 298598400, while the sum is 72.

The square root of 6998558688 is about 83657.3887232921. The cubic root of 6998558688 is about 1912.7998818237.

The spelling of 6998558688 in words is "six billion, nine hundred ninety-eight million, five hundred fifty-eight thousand, six hundred eighty-eight".