6691997088 has 240 divisors, whose sum is σ = 22920226560. Its totient is φ = 1875654144.

The previous prime is 6691997083. The next prime is 6691997107. The reversal of 6691997088 is 8807991966.

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

It is not an unprimeable number, because it can be changed into a prime (6691997083) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 958153 + ... + 965111.

It is an arithmetic number, because the mean of its divisors is an integer number (95500944).

Almost surely, 2^6691997088 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 6691997088, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11460113280).

6691997088 is an abundant number, since it is smaller than the sum of its proper divisors (16228229472).

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

6691997088 is a wasteful number, since it uses less digits than its factorization.

6691997088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7041 (or 7024 counting only the distinct ones).

The product of its (nonzero) digits is 11757312, while the sum is 63.

The square root of 6691997088 is about 81804.6275463681. The cubic root of 6691997088 is about 1884.4527290429.

The spelling of 6691997088 in words is "six billion, six hundred ninety-one million, nine hundred ninety-seven thousand, eighty-eight".