6691445488 has 90 divisors (see below), whose sum is σ = 16331023944. Its totient is φ = 2647112832.

The previous prime is 6691445477. The next prime is 6691445513. The reversal of 6691445488 is 8845441966.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 107245 + ... + 157747.

Almost surely, 2^6691445488 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 6691445488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8165511972).

6691445488 is an abundant number, since it is smaller than the sum of its proper divisors (9639578456).

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

6691445488 is a wasteful number, since it uses less digits than its factorization.

6691445488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50551 (or 50525 counting only the distinct ones).

The product of its digits is 6635520, while the sum is 55.

The square root of 6691445488 is about 81801.2560294767. The cubic root of 6691445488 is about 1884.4009511420.

The spelling of 6691445488 in words is "six billion, six hundred ninety-one million, four hundred forty-five thousand, four hundred eighty-eight".